You could try something else—like fruit. My older chickens will kill for apple pieces, blueberries, cantaloupe. Mine like corn chips too. Good luck!
As they get older they will get kitchen scraps as a regular part of their feed. I've been limiting such things strictly now while they're still babies.
The smallest bag of mealworms I could get was still way too big and it looks like I'm going to be a loooong time using it. *sigh*