@Brian, the opposite. Gerty likes to stick to the wall under the plant or fasten herself to an upper corner of the tank wall. I lack a hydrometer (is that the humidity one? Hygrometer? I forget.) but I mist her tank 3-4 times daily, I try to keep it nice and damp in there for her.
Yes, I use paper towels for substrate.
Freezing the crickets is a good idea. I might try that. She finally caught one this morning.

@Michelle, I did have a UTH, but instead of warming up my tank, but it merely warmed up the air on the outside of the tank. I wasted 30 bucks and who knows how much I added to the electric bill. >_<
I've never tried tong feeding because Gert's so small. I know larger frogs take to it well, but I'm concerned the tongs would somehow damage her bitty mouth. With my last frog, I was able to grab the cricket by the leg and wiggle it in front of his nose. I haven't tried that yet with Gert.
And would a 3-5 degree drop really have that much effect on a frog? o.o