Hornworm food?

I just bought some horn worms in a cup and their food is almost out but I still have about 20 of them. I don't have a car and I live far from a pet store so I was wondering if there are any veggies I could feed them that are non-toxic for my veiled chameleon?

Also I got a cup of phoenix worms, am i supposed to feed them anything?
 
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