Frogs grow in five stages. First is the egg stage. The eggs are laid in wet places in slippery masses that hopefully don’t get slurped up by other hungry animals. The eggs are called a “frog spawn.” There the single cells divide for the next 20 days. And hopefully some survive to get to the next stage. The eggs feed on the little yolk sac inside. At 21days, the eggs become tadpoles. They break out of their jelly egg homes and live in the weeds until they can swim. They eat algae and grow until their swimmy tails grow big enough to swim around. After about five weeks the tadpole begins to grow legs, starting with the back legs, which is the third stage. In the fourth stage bulges grow behind their head and that’s where their front legs will grow. Their tails shrink. Their lungs grow so they can live on land. It’s almost a frog now.