I had a stubborn frog for a while. he wouldn't eat anything but crickets, then one day he tried a nightcrawler chunk.. now he refuses anything that's not nightcrawler, heh. You're just going to have to be patient, keep offering when you feed. Maybe you could wait an extra day or two of not feeding then offer one. The same green that won't take anything but nightcrawlers pretty much refuses to eat from the tongs anymore, too. It's weird, as a baby he always did.. now he just looks at me weird. If I set the nightcrawler in front of him, he'll eat it. I don't remove him from the tank and he's on eco earth, I pack the eco earth down a bit where I'm going to set the worm so that it doesn't get as much dirt on it as it would if it was loose.

If I remove my frogs from their homes to feed them.. they pretty much refuse to eat and do nothing but try to escape. So that doesn't work for all of us. Good luck getting him to take a worm.. they're a lot better than crickets once he starts eating them, that's for sure.