Recently came down with Strep throat, on penicillin to treat it. Tongue turned orange, scraped it with teeth, felt like hair came off. What is this?

"Hairy tongue"... ...sometimes accompanies various respiratory infections like viral pharyngitis or strep throat, and also can appear during treatment with antibiotics. It's harmless and should clear up soon. Discuss it with your doctor if it continues or you otherwise remain concerned.