Could be, but the mealies could have also possibly crawled out.
Anyway, if your RETF is a 1-incher, you should be feeding it fairly small crickets. Even if they can eat the larger ones, at least mine find the smaller ones more appealing (although some of my other frog species seem to think bigger=better). Also, I've read that there have been some studies that found that many smaller crickets have higher nutritional value than less larger crickets, but I certainly can't verify that.
Anyway, I do hope that your froggies start to eat better! Sometimes, they're a little uneasy for the first few days in their environment (or due to any changes) and may not eat as much then 