The stage wherein frogs have a tail but no legs is called: Letter D or tadpole. There are different stages or cycles of a frog’s life. It starts with the egg which is called frog spawn. The egg begins as a single cell only and it is protected by a rubbery covering until the egg starts to develop. Once they are ready, the single cell will begin to split into two cells and so on and so forth.
The next cycle would be the formation of the embryo – this is where their organs and gills begin to form. The embryo is protected by the internal yolk which in turn supplies it with nutrients for twenty-one days. After 21 days, this is when the embryo leaves its shell and becomes a tadpole – with tails, but with no legs. The cycle continues until they become a full-grown frog.