Fish that can talk in fantasy

 

Those fish from Nemo can talk like a human in fantasy they can breath in the water and on land because those fish have human blood

Those fish from Shark Tales can talk like a human in fantasy they can breath in the water and on land because those fish have human blood

Sponge is a talking sponge because he has a lot of human blood and human DNA and he can breath under water and air.

If SpongeBob did not have any human blood and Human DNA he will not be a talking sponge.