Here are three simple ways to say it:
- Frogs lay eggs in water. The eggs hatch into tadpoles. When tadpoles grow up, they become frogs that live on land.
- Frogs start life as eggs in the water. Those eggs hatch into tadpoles, and later the tadpoles turn into adult frogs that live on land.
- Frog eggs hatch into water-swimming tadpoles. After they grow and change, the tadpoles become adult frogs and move onto land.
Quick steps: Eggs in water → Tadpoles → Adult frogs on land.