Their lungs and diaphragm
The genitals
The anus.
The mouth.
The mouh helps in the igestion of the body.
Yes. Frogs can breathe via lungs or skin. When above water, they rely mostly on lungs, aided by skin. When underwater, frogs "breathe" solely through their skin. (To be more accurate frogs perform gas exchange with their skin, as breathing pertains to lungs.)
A fish breaths through it's gills.
A muscle called the Diaphragm
Frogs have four limbs, two hind legs and two forelegs.
You breathe in through your nostrils or mouth, which allows air to enter your respiratory system and reach your lungs where oxygen is absorbed into the bloodstream.
The diaphragm relaxes to help squeeze the air out of your lungs. When the diaphragm contracts, it flattens and pulls air into your lungs. When it relaxes into its dome-shaped position, air is pushed out.
The horse does have a frog on their hoof except it is not the real animal. It is a part of their body/hoof.
The lungs are part of the respiratory system or pulmonary system.