Unfortunately, Hyla andersoni is an endangered species and protected by federal law. I personally think its the most spectacular of our treefrogs, followed by gratiosa and versicolor.
I have never kept Pseudacris crucifer, but I do keep Dendrosophus leucophyllatus, another small treefrog. I keep mine in a large "critter keeper" with a false bottom and a paper towel between the top and the rest of the enclosure. The reason for the paper towel is to keep their food from escaping, while providing ventalation. I feed them fruit flies, been weevils, and small crickets. The first two I culture myself.