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This system is a series of organs that converts food into energy by decomposing it and making it into fuel the body can use.  This system also emits waste from the body, which includes toxins.

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Mouth:  This organ is located in the head. It has a structure of a jaw to move the two sets of teeth, a tongue, and cheeks. Together these things function to chew, and push food towards the esophagus.
Salivary Glands:  Are located in different places in the mouth area, such as under the tongue, the back of the throat, and near the jaw.  Their structure is a series of ducts that secrete saliva.  The function of the saliva is to help break down food.
Esophagus: Is located from the mouth, stretching to the abdomen and connecting to the stomach.  Its structure is a long thin tube made of muscle tissue, making its function of carrying food and liquids to the stomach much easier.
Stomach: Is located in the abdomen, connected to the esophagus.  Its structure is a sack made of muscle tissue.  Its function is to mix food with digestive juice to help it break down to be used for its nutrients.
Liver:  Is located on the right side of the abdomen, adjacent to the stomach.  Its structure is a dark red wedge shaped organ, whose function is to make bile.
Gallbladder:  Is located anterior to the liver.  It has the structure of a small greenish sack thats function is to hold bile while the body isn’t digesting food.
Pancreas:  Is located just under the gallbladder. It has a loose, lumpy structure, and its function is to make a digestive juice that breaks down carbohydrates, fats and proteins.
Small intestine:  Is located underneath the stomach and liver, and its structure is a very long tube that is compacted into a small area inside the large intestine.  Its function is to absorb nutrients and water while moving the waste towards the large intestine.
Large intestine:  Its location is all around the anterior inside of the abdomen.  Its structure is a long, lumpy tube that function is to make waste into a solid, and push it towards the rectum.
Rectum:  Is located at the end of the large intestine, and is a structure of a small tube that functions to hold waste until it is expelled from the body.
Anus: Located at the end of the rectum, connecting to the outside of the body.  It is structured as an opening to the outside of the body, functioning to expel waste.

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The digestive system relates a lot to the circulatory system, and the endocrine system.  The digestive system receives nutrients from the food you eat, and then those nutrients are absorbed through different digestive organs into the circulatory system.  The circulatory carries these nutrients throughout the body, it also carries chemical hormones from the endocrine system that send signals to the digestive system telling it how fast to digest.
Ways that show how the nutrients of what you digest goes into your circulatory system are things like cholesterol levels in your blood, or how some people who eat a lot of fat have a lot of fat lining their blood vessels and veins.  Examples of how your endocrine system sends signals to your digestive system are the endocrine system makes insulin through the pancreas.

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Gastroesophageal reflux disease:  Or “heartburn” is the connection between the stomach and esophagus being weak and allow stomach acid to irritate and inflame its lining.  This creates a burning sensation in the chest, which is why people call it “heartburn”.
Jaundice:  The yellowing of the skin and/or eyes that is a result of too much bile building up in the body tissues.  This is a consequence of blockage in the liver and a lack of drainage to the intestines.

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The digestive system in humans and in frogs is very similar.  The organs and the way food is processed is almost identical to humans.  The main differences are that unlike humans, frogs do not use their teeth for chewing, but for holding prey in their mouths.  The other difference is that the small intestine of frogs is shorter than humans, so they must absorb nutrients in the ileum in addition to the small intestine.

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The tissues and muscles in a system that expel toxins.  It also transports lymph, that contains white blood cells through the body.

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Thymus:  Is located in the thoracic cavity, under the neck.  Its structure is two lobes of lymphoid tissue.  Its function is to train white blood cells to fight infection.
Spleen:  Is located in the upper-right abdomen area.  Its structure is a small, sack like organ, that functions to filter blood.
Tonsils:  Are located in the back of the throat, near the nasal cavity. Their structure are like lumps on the back area of the throat.  They function to fight infections.
Appendix: Is located at the end of the large intestine in the lower right hand side of the abdomen.  Its structure is a pouch of lymphatic tissue.  It has no function, but does release a small amount of mucus into the large intestine.

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The lymphatic system relates closest with the digestive system, and circulatory system.  The lymphatic system uses the circulatory system to deliver nutrients, oxygen, and hormones through the blood.  Similarly, the lymphatic system uses the digestive system to transport as well, but mainly to expel toxins from the body.
The main purpose of the lymphatic system is to expel toxins, get rid of cancer, ect, and that’s why it cooperates with the other systems.  It also another center of nutrients and hormones, it produces and expels things, and that’s why it needs other systems to carry out its purpose.

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The lymphatic system of the frog is similar to a humans in their purpose, but there structure is quite different.  In a frog, most of the lymphatic system is a series of nerves and vessels, and has less lymphatic organs like humans do.  An organ they have that we don’t is the lymph hearts, they help pump lymph through the frog’s body.  They also have organs that we do, like the spleen.

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Cancer:  The lymph nodes in the body can become swollen with cancer, and this can cause very fast spreading to the rest of the body, making it very dangerous.  The symptoms of this depend on whatever organ the cancer spreads to.
Appendicitis:  This is when the appendix swells up with puss, and can burst.  This condition can be fatal if you don't treat it immediately with antibiotics.

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The endocrine system is the collection of glands that produce hormones.  These hormones do things like regulate metabolism, growth and development, sexual function, tissue function, mood, sleep, and reproduction among other things.

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Hypothalamus: Is located in the lower central part of the brain.  Its structure is a bulb-like shape, that's function is to regulate satiety, metabolism, body temperature, and secreting hormones.
Pituitary gland: Is located just under the hypothalamus and its structure is a sphere about the size of a pea.  Its function is to release hormones that control a lot of other endocrine glands.
Thyroid gland:  Is located in the front lower neck,  its structure is a ductless gland thats function is to regulate hormones, metabolism, and bone growth.
Parathyroid glands: Are located outside of the thyroid gland, their structure looks like four small spheres on the thyroid.  Their function is to regulate calcium in bone metabolism
Adrenal glands:  Are located on top of the kidneys, structured like little triangles.  Their function is to balance hormones, and regulate sexual function, salt water in the body, and the immune system.
Pineal body:  Is located in the middle of the brain, its structure is like the pituitary gland, but a but smaller.  Its function is to regulate sleeping in the body.
Reproductive glands:  Are located in the sexual organs of the male and female body, their structure is either testes, or ovaries.  The function of these glands is to create hormones that make females female, and males male.
Pancreas:  Is located behind the stomach, and its structure is an elongated lumpy looking organ.  Its function is to regulate sugar levels in the body.

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The endocrine system interacts a lot with the circulatory system because the circulatory system is how the endocrine system sends hormones to the rest of the body.  For example if the pancreas releases insulin, the circulatory system will take it to whatever organ needs it for energy.
The other system that it relates to is the digestive system.  They share organs like the pancreas, and they both perform acts whos results travel through the circulatory system to the rest of the body.  In the digestive system food is broken down and its nutrients travel through the body, and in the endocrine system hormones are made and travel through the body.

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Thyroid nodules are small lumps that develop on the thyroid, a small portion of which contains cancer.  Most of them are benign, only 10% actually contain cancer.

Thyroiditis is the inflammation of the thyroid that can be caused by a number of different disorders.  It can also be caused my the drugs interferon and amiodarone.  It can be the cause of a lot of thyroidal pain.

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This system is very similar within a human and a frog.  They have similar organs or the same organs as we do, such as the thyroid, adrenal gland, and pancreas.

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https://www.niddk.nih.gov/health-information/digestive-diseases/digestive-system-how-it-works

http://slideplayer.com/slide/8126845/

https://endocrinesystems.weebly.com/how-the-endocrine-system-functions-with-other-systems.html

https://www.dmu.edu/medterms/digestive-system/digestive-system-diseases/

http://www.dummies.com/education/science/anatomy/what-organs-are-part-of-the-lymphatic-system/

http://altered-states.net/barry/newsletter559/

http://www.notesonzoology.com/frog/lymphatic-system-of-frog-with-diagram-vertebrates-chordata-zoology/8151