Kale, collards, dandelion, mustard greens, endive, escarole, turnip greens, dark lettuces, squash, carrot, sweet potato, apple, raspberries, etc. The non-leafy items have to be cut up in to very thin pieces so they can eat it. Not all veileds like veggies or fruits.
Other insects include fruit flies, house flies, blue bottle flies, snails, some butterflies, some moths, stick insects, cicadas, katydids, Other roach species (discoids, lobsters, and lateralis being very popular) isopods, some caterpillars, spiders, etc. All prey items should either be collected from sites that are as far away from housing and high traffic roads OR should be cultured instead of wild caught. Flies and snails for example should be cultured or bought online as they can carry parasites.