Does a frog have an exoskeleton or an endoskeleton and why?

They have an endoskeleton. The prefix exo- means external and the prefix endo- means inside. Frogs are vertebrates which means they have an internal skeletal system with bones and a backbone, they do not have a shell like a snail on the outside without bones on the inside. They do not have a hard coating on the outside instead of bones like an insect does.