Welcome to the Forum. Lots of great people here who own White's who will be able to help you with any questions...though they may pester you for a photo or two. I, myself, don't own these types of frogs, but I can take a (hopefully) educated guess on a couple of your questions for you just to get it started.
1. It does take some frogs a bit to settle into their new environment. However, if a couple more days pass, you might want to take Bluey and Yoda into the vet just to ensure they don't have any internal parasites that are affecting them.
2. I would not recommend leaving crickets in with them, simply because cricketc can and will bite frogs. However, if you want to keep your crickets in one place to give your two a better chance of catching them, try placing a small glass bowl roughly 2" deep and sink it into the soil in your enclosure; place your crickets in the bowl or let them loose in the enclosure and they will usually end up in the bowl and be unable to get out. As your little frogs grow, increase the size of the bowl as necessary. Handy little trick several of us members learned about recently.
3. Soil is a good substrate. However, covering it with moss or leaf litter is recommended. It keeps dirt from sticking to your little guys when they do venture down, can help with humidity levels in your tanks and is visually sharp to look at.
4. This question I cannot help you with. However, there is a caresheet on White's Tree Frogs to the left under Frog and Toad Care Articles. It might mention in there the proper temperatures these guys need.
Congrats on Bluey and Yoda, and, just to get things really going....can't wait to see some pictures!![]()