The bottom picture looks very much like P. crucifer, as does the top, but a more dorsally-oriented shot would help for the first guy. I've not seen P. triseriata recent morphs, though.
A moist paper towel should be fine. Some will suggest an unbleached paper towel, but I've never known where to find those. I look for paper towels without any dyes or patterns and I haven't had any trouble when using them. You'll have to judge when to change them based on what kinds of foods you feed and how often you feed these little guys. Give them some small pieces of bark, leaves, and or moss to hide under, and mist frequently (because the frogs are so little). If you're in a residential area, try to find cover objects farther from where people might be using pesticides or fertilizer. Another trick: put celophane or a paper towel between the tupperware and the lid (don't worry, there will be sufficient oxygen transmission through both, although do watch the temperature with either). Doing that will keep the humidity up. You can keep them in tupperware small enough to hold a sandwich, but that's about as small as I'd go (although they can survive in smaller).
Have you decided what you'll be feeding them? If you're going with fruit-flies, which, apart from termites or springtails is probably the easiest to feed with when frogs are this little, then the celophane or paper towel over the lid will help keep the flies from escaping. Your peepers will climb up and down the walls going after flies. Good luck!
