The young to becomes an adult treg b. Eggs hatch inte tiny tadpoles. They use their gills for breathing and fails for swimming c. Female frogs lay eggs on water plant 5. d. As the tadpole grows, hind legs start to appear. Later, front legs appear e. As the tail of tadpole becomes shorter, its gills also disappear, and lungs develop. The young frog can now leap onto land.