I keep Green tree frogs and Dainty Tree Frogs. For Green Tree Frogs a higher tank is preferable. I use spagnum moss as a substrate, and have a small bowl of water sitting on the floor of the tank. I have several branches sitting in the tank.
For the Daintys i have one of those plastic aquariums with the clip on lid. I have moistened spagnum moss as a substrate and a bowl of water sitting on the floor of the cage. I also have cuttings from palms sitting in the cage which which the daintys use to rest on during the day.
Good luck obtaining any 'true' burrowing frogs. Those are very rare in captivity. I was talking to someone who kept a desert burrowing frogs and he had a tank which was full of sand. Once a year he flodded the tank at waited for the frog to surface. Once it had emerged it was fed and then the tank was allowed to dry out.
For frogs in the Mixophyas genus, which will burrow a tank with a bowl of water, and a deep peat moss substrate, will be sufficiant.
For Ground frogs, an adequatly sized tank with a spagnum moss substrate and appropriate hiding spots and a bowl of water will be sufficiant.
Hope this is some help,
Alex