I found Bannas to be the best for them .. that "nanner scent" helps .. I think .. and it seems to "Blow" them up some ... While I was in the retail bizness I made the mistake of feeding them some "nanners" then all my coustomers wanted some of them "nanner" crickets or "Chirping Bugs" ... 1st time I have ever heard of freezing them .. something else to try.
JSC