I just went back and read all your previous posts and people on this forum have been trying to help you with this issue for over a month! Has you cham been to a new vet for the MBD as people told you to over a month ago? If not do that immediately, also have you changed your supplements as people told you to, to calcium without d3 everyday and calcium with d3 everyother week and multivitamin on the opposing everyother week? As I read your previous posts you seem to be ignoring advise and concerns for your chameleon.....people take advise get him to a qualified herp vet and get him the help he desperately needs!
Did he give him any injections? So how are you supplementing now? His tail has nothing to do with his tongue. Your chameleon has MBD and that is most likely why he cannot use his tongue. Not being able to shoot the tongue could be due to an injury, but considering your chameleon's condition it is more than likely related to his illness.
He had been to the vet because he had a prolapse ( he had been receiving to much of the same food ) and the vet did not say that he had anything about him having MBD and about his tongue all he said was I need to get him feeding again ?