Hi Rachel,
Trace is right about the green bugs. And though I don't know the rationale behind it, they seemed to go crazy for slugs and roaches more than they ever did for crickets or most other types of worms.
The dish was always empty within a few minutes if I had roaches, butterworms, and slugs in there, as opposed to mealworms and kingworms and crickets being in there for days at a time!
I'm not sure about the 'taste' bit, I think they do have a sense of taste even if it is very limited. Many arboreal lizards/geckos evolved to eat/like fruit, maybe try gutloading with grapes, mango, papaya, figs or cantaloupe a few hours before feeding.
My female veiled used to love red grapes (seedless).