I've had an African clawed frog for about a year. Recently he's had a brown bulge on his rear end, it looks like poop trying to come out. It's not hard, so it's not pebbles from the tank. It looks like he doesn't have a butt hole anymore though. I just saw him trying to poop but I know nothing has come out. I've tried to feed him blood worms to help him go but he won't eat them.