Arizona won't let anyone take them out of the state legally, so you are limited in your options. Provided you've never kept them with or near (by near I mean in the same building as) other amphibians, it's possible you could release them locally. However, you will want to call Arizona Fish & Game to confirm that releasing them would not be in contravention of local laws. Obviously you can't release them at the moment - it will have to wait until the weather warms up.

You don't have to hibernate them. At that age I would just keep them warm and awake until spring time and provided your inquiries prove positive regarding release, then release them in late March or April when the first spring rainstorms come.