Quote Originally Posted by LobsterMagnet View Post
Most of the talking animals in the series have usually been summoned creatures. I can accept them talking due to their presumed mystical nature, but there is no precedent for non-summoned animals talking at all. I mean look at Tsunande's pig it just grunts and squeals. Which is honestly why I hate the stupid talking ostrich since it goes against the lore already established in the nartoverse unless it is some kind of mystical ninja ostrich
The frogs don't come from another dimension you know. They live on a mountain. It's a real place. The summoning jutsu just teleports them to the user.

The same could be done with any animal.

As far as the pig is concerned, Akamaru just barks also, but he's clearly intelligent and capable of performing jutsu. Yet Kiba's mom's dog can totally talk.

I think the difference between normal animals and ninja animals is really just a matter of training.