How is your frog doing Chase? 3 weeks without food or care is a serious health concern . Caspian recommendation for pedialyte bath is very good; please ensure it's around 80F.

Problem with mealworms is that they are low in nutrients, hard to digest, and those pincers can damage the frogs digestive tract. If no crickets still; might try night crawlers (Walmart's sport section); maybe frog will eat them and they are way better nutrition than mealworms. Good luck !