Black spots on tongue?

MaMaBee🐝

My almost 6 week old baby is ebf and has had a white tongue almost the entire time since I have had her. I asked her ped if it was thrush and he said no just milk tongue. But her white doesnt go away even if I try to wipe it off with a wet cloth. And now she has this black spot on her tongue that I cannot get off. Has anyone seen this or know what it is?!?!