The eyes appear shepherd. If those are gray/blue/black marks on the tongue, it can be an indication of chow chow.
Not all chow mixes have black tongues or spots. ;) It doesn't indicate they have chow in them.. My friend's golden retriever has a spot on his tongue and he's purebred. My Rottweiler mix, Jenny (RIP) had a spot on her tongue and was no way a chow.