Is he drinking fluids and eating? His tail may be lowered because he feels bad or is dehydrated. I agree, that appears to be frostbite. It will take some time before you see how much damage there will be. His comb could heal, or possibly become more rounded off. Try getting him to eat a warm mash of feed, mixed with water and scrambled egg bits. Try to warm him if he is cold.
What do his poops look like? How are his feet looking? Is there any discoloration?
havent seen any poops...feet seem a bit swollen...he is drinking...this is his back where the feathers are coming out..just went out to take this pic of his back...very lethargic..