Yes, Chows can have blue tounges, but purebred dogs of a different breed can have spots on their tounges.

Here's a website that says purebred Aussies can have tounge spots, so I'm sure purebred Pits can too. ^_^

tounge spots in aussies


oh, and PS - this post should have been in dog general, not pet general. pet general is mainly for pets other than dogs or cats.