Do tadpoles only turn into fogs in a certain season?

Question

This summer we caught some tadpoles. They were all dinnerent sizes, one of them already had it's back legs. A few weeks after we brought them home, the one with the back legs turned into a frog. We have had the other ones for a few months now, and none of the others have started to change. Someone told me that they only change in a certain season. Is this true??

Answer 1

No, it's how old they are and what stage of development they are in.