If you aren't sure that they might like something, by all means, try it!
Just make sure it's either peeled or REALLY clean if there's any possibility that it was sprayed.
Heck, I didn't have anything else when I got my latest batch and tossed in hunks of a broken up pomegranate; turns out they love the white stuff but don't particularly like those yummy seeds, although they'll suck 'em dry if they must.
Everything I've given them so far has gone down eventually (yep, I've been doing this what, a week now?? LOL!
)--parsley stems were considered primo, celery stems (these aren't commercial celery, a friend grew them for seed, so they're pretty small stems), pomegranate and apple cores, although the applecores were only 'eh' and had to be pulled before they started to rot.
Have a place I can get mealies for eight bucks a thousand over 3K, but thinking hard about space and the utter fascination shown by the cats over the noises from the bin...flashbacks of Amy on her hands and knees vacuuming up mealies....hm....