I've found my White's is only really interested in larger prey! I bought some smaller crickets this time (they were cheap!) and he hardly looks at them. After a long while he'll eventually eat a few, but quickly loses interest again.
I recently bought some cockroaches (Turkistan) and they were a lot larger than I thought they would be (ordered online) I put one in alongside the smaller crickets, WHAM! it was the first bug to be gone! I'm hoping to breed the roaches, cheap food for froggie! Though I have to do some research into how to keep and breed them.