It kind of depends on how you count them.
1. There’s the frog of course.
2. When frogs mate, they lay eggs.
3. The eggs hatch into tadpoles, a larval state with gills, a tail and a lateral line
4. The tadpole will metamorphose into a froglet with legs and lungs
5. Some definitions define a tadpole with legs and a tail state and a froglet state that is basically a tiny frog with a tail before it loses the tail and becomes a frog properly.
The metamorphosis from a tadpole into froglet is gradual. I don’t think biologists are particularly concerned with how many steps there are.
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