Frogs go through distinct stages of development from egg to adult. They begin as frog spawn, laying eggs in water. These hatch into tadpoles with tails and live in water. Over 5 weeks, tadpoles grow hind legs and lungs as their tails shrink. They become froglets and then young frogs, shedding their tails and developing fully on land as adult frogs that live mostly on land and eat insects.