If a human brain would be placed inside that of an animal: Could it talk? Assumption: Animals can't talk 'human' because of their small(er) brain.

Perhaps a strange thought, but I was really wondering: If we could place a human brain inside that of an animal: Would we be able to speak 'human', instead of 'animal'?
Part of what makes speech possible is a complex set of interactions between a number of different muscles that control aspects of producing speech sounds like airflow and mouth shape. Humans are unique in the complexity of the sounds that we can produce. Even if we granted the science-fiction that would be necessary to put a human brain into a chimpanzee and somehow managed to reconnect the analogous neural pathways to sensory organs and effectors, human speech wouldn't be possible because it requires a human body.

This Wikipedia page gives an overview of the biological developments that support speech.