Question

why do frogs produce a large number of gamete

Answer 1

Amphibians like frogs reproduce by external fertilization. That is, the female and male gametes fuse outside the frog's body. This usually happens in water, thus there is a possibility that the male gametes never make it to the eggs, unless there are lots of them.

Answer 2

Because female produce more number of eggs (ova) and male produre more number of sperms.hence frogs produce large number of gametes.