It's not all about the flies

The digestive system starts with the mouth. A frog sees something that looks tasty and snatches it to eat. Usually frogs eat insects, other frogs, or small mammals. They also have teeny teeth, that are used to grind food before the food is eaten. The food then moves through the esophagus into the stomach. It then is passed to the small intestine where most digestion occurs. Frogs carry pancreatic juice from the pancreas and bile - which is produced in the liver - through the gall bladder from the liver to the small intestine, where said fluids digest the food and extract nutrients. The food then passes into the large intestine where water is extracted and all wastes exit through the cloaca.