Use the adults to breed and feed smaller ones. They may not take them right away but they will take them. I had a male that refused them at first but he came around and eats everything now.
My chams loved dubia roaches for just enough time for me to get a colony going, then they quit eating them. I plan on getting strict with them this winter and offering them mainly the roaches. I think I can break them if I remove all worms from their diet.