If there is only small spots of black on the tongue it could be any breed, thats just the pigmentation. I know of a few awesome pure bred dogs of champion lines of different breeds with some black spots on their tongues.

But if there's a lot of black or if it's more of a blueish color then yes most likely she has chow or sha-pei. (Ainu dogs like a shiba inu have black tongues too but they are very rare outside of Japan).

My friend has an Aussie/Pitt mix that looks a LOT like her, including the tall pointy ears. Although she doesn't look a lot like either breed that really is what she is, my friend knows the parents of both dogs. When you mix breeds you never really know what you're going to get. lol

But I see quite a bit of Shepherd in Savanna.
She's a cutie!