What is ant immature form of an animal such as a tadpole called?

Here's why:

* Tadpole is the specific larval stage of a frog or toad.

* Larva is the general term for the immature, often worm-like stage of an insect or other animal that undergoes metamorphosis (a dramatic change in form).

So, while a tadpole is a larva, not all larvae are tadpoles. Other examples of larvae include caterpillars (butterflies and moths), maggots (flies), and grubs (beetles).