Snails and slugs are fine... I would be careful of large ones though, as the slime they excrete *can* gum up their bill rather badly...
Also, just an fyi... slugs and snails are often intermediate hosts of worms like gapeworm... if you suspect worm issue, best to get a fecal float done by a vet...
Absolutely ok... they're outside, got access to dirt/sand/grit, right? My 2 mommas had their babies out foraging by day 2... eating roly polys, worms, grubs and any bug that moved...
Any beans if they are cooked, never feed dry beans raw those are toxic... says to overcook, in fact...
Raw is green beans, chopped very fine... yours are outside with mama, right? So they should be able to get grit out of the dirt etc, but I would make sure they have accese to some...
Frozen...