Frogs need a variety of insects to eat. They prefer live insects to dead ones as it is the insect's motion that stimulates the frog to eat.
Small breeds of frogs eat daily. Medium-sized frogs eat two or three times a week, while large breeds of frogs only eat once a week or less. Adults eat insects that they catch with their long, sticky tongue, snails, slugs and worms.
Young tadpoles feed on algae at first, but grow to become carnivorous.
Along with absorbing the moisture they need through their skin, frogs also take in extra oxygen with the water they take in.