Ohhhhhh these are so cool and pretty! Need to look if I can get them, not for frogs though
I guess you can modify them for pacman frog. Can you fill it with the substrate without it falling out? And heating? Although in Texas you probably don't really need to worry about low temps. Lol
Surprizing though you are saying your guy is not comfortable in his tank, perhaps if you cover 3 sides of it and add some plants hanging to make him feel more secure would help?