Your frog needs variety in it's food. Try offering bits of earthworm again. Try roaches, waxworms as a treat.........the mealworms should not be given as a staple diet, the chitin is difficult for them to digest and can cause an impaction if they are fed as a staple.
Try some molly's or guppies. You can also try the powdered food from Samurai Frogs out of Japan or make your own mix as some of us do.
Keep in mind that calcium & vitamin supplements are crucial to it's health but remember that too much can do just as much harm as too little.

We breed these guys and have learned quite alot through the years. Please feel free to ask any questions you have in the future!!

Good Luck!!