Hey your pup looks just like ours.Ours is a rottie heeler mix.The mom is purebred rott and the dad was half blue heeler, half rott.This is a pic of her a few weeks ago at 9 weeks.Ours has some white on her chin and toes though.
Im under the impression that only certain breeds like sharpei and chows have black tongues though?
Definitely Rottweiler mix. You'll be able to guess more accurately once he grows and he fills out to his adult appearance.
Any breed of dog can have a spotted tongue. A solid blue-black tongue is restricted to shar peis and chows, but tongue spots can be seen on any breed. You cannot go by tongue unless it is solid blue-black.