Turnip greens... according to many others, and most previously by bushbaby (forum member).
What do you mean by OKAY foods for crickets that won't transfer to the chameleon? Feed them greens and rotate these: turnip, mustard, escarole, endive, kale occasionally. At least those are all that have been highly recommended and what one can find at the local grocery store. I started using cricket crack lately and the cricks (and other feeders) seem to REALLY like it. Also, dry gutload is important.