Here is a grown frog on a lily pad.

A frog on a lily pad. Its skin is smooth and shiny with water.

The frog has smooth, moist skin. Moist means a little wet.

Now look at how the frog's life began.

Tadpoles in the pond: tails, and no legs.

The frog hatched from an egg in the pond water, as a tadpole.

The tadpole swam in the water and grew legs.

Then it left the water to live on land.

Eggs in the pond, a tadpole in the pond, a frog on the bank. Water first, then land.

An animal with smooth, moist skin, which starts its life in water and then lives on land, is called an amphibian.

So the frog is an amphibian.

The frog: smooth, moist skin, yes. Starts in water, then land, yes. It is an amphibian.