gee that is so good of you to try to help this poor kitty, but without seeing theres no way anyone here can be of much help, we are only cat owners ourselves and not Vets.
Please do not try and position the jaw yourself, cats jaws are so small you could easily dislocate if its not already...or break it.
I think it sounds like more than a tongue injury if kitty can't eat or drink and if he's not eating he will very soon become really ill. cats get whats called 'fatty liver disease' a condition that develops very quickly when they refuse food, and this can be fatal quickly.
I hope you will find it within your means to take this poor kitty into a Vet to be examined properly, there are some ideas on how to get help with Vet bills.
http://www.medhelp.org/health_pages/Pets/RESOURCES-TO-HELP-PAY-FOR-VET-CARE/show/535?cid=2
I hope you will take this kitty in for help. give yourself a pat on the back for caring....