Now that you just mentioned he has grown another inch it made me think of something. If he was around inbetween 2 and 3 inches when you got him that would more then likely make him a juvenile. They should be fed every 2 to 3 days. And if you force fed him that worm you need to stop force feeding and let him chill. If you got him 2 weeks ago and you have been trying to feed him every night since 1. he is probably full 2. he is probably scared and severely stressed out. I would leave him be for a few days and then see what happens when you try to feed. Force feeding should only be done when the frog is in dire need of food and visually has lost weight. It is very stressfull and if he gets to stressed it lower his immune system and then he will vulnerable to becoming sick