>>Im getting back into keeping and breeding herps after about five years or so and was thinking about starting with a fair sized viv and was woundering if you could keep a few small crested geckos or some dwarf cameleons in the same incloser with dart frogs
Not just no, but hell no. Crested geckos are from drier areas than darts, plus they would get big enough to eat their cagemates. Dwarf chameleons might work, but you need more experience. If you have to ask if you can keep crested with darts, then you don't have enough experience.