Baby White's Tree Frog?

I have a very small baby Whites Tree Frog. I'm afraid he is close to death, because I haven't seen him eat at all and he looks extremely skinny, almost starved. I've tried waxworms, mealworms, and crickets that are all small enough for him to eat, but he doesn't seen to eat. I've even tried to hand feed him, but that doesn't work either. We got him mid-April, and I'm not sure how much he's eaten since, but it's enough to barely keep him alive. Any suggestions on what to do? Or do you think he's doomed?