Tomato Frog Questions

I acquired a Tomato frog at a reptile expo last weekend; I've had a C. ornata for a while and things are going well, so I decided to try another burrowing species.

So I found one a little bigger than a golf ball (when not puffed up with air or soaking) and bought it. I brought it home and set it up in a 5 gallon tank (I plan on upgrading as it grows) with a water dish, some deep earthy substrate (coco fiber mixed with organic potting soil and some other things) with a piece of cork bark covering one third of the tank if it wants to have shelter.

Temps are about 73-75 during the day and around 70 at night, it has UVB exposure (although not intense) and I mist twice a day.

The thing is, it will *not* eat. I watched many videos and read many articles and caresheets about them prior to getting mine, and everything pointed towards a voracious appetite, but mine has shown little interest in food. In fact, it seems to get nervous and puff up every time I get close to it. I left a cricket in with him/her for a few hours, but it didn't eat it, so it was removed. A few hours ago, I gave it a soak in some lukewarm water to see if that would help. It urinated; a lot, and seemed to be more active all of the sudden, but it might have just been freaked out from my handling of it. I returned it to the tank, and offered an earthworm, knowing that burrowing frogs probably would find such a thing irresistable, and it made an attempt to eat it, but then stopped and returned to shuffling around in its water bowl as a tried to tease it into eating the worm.

Is there something I don't know about these guys that is causing this, or do just need to give it more time to settle in? I haven't treated for chytrid yet, but I plan on doing that tonight. I just hope he isn't impacted or anything...