Update: Good news and really really bad news! They're not parasites!
After soaking the 'infected' worms over night, no new mites appeared, on closer inspection I think are just something common from outside that was left unchecked in the terrarium. The worm is definitely from gnats or drain flies.

BAD NEWS
My frogs plumpness was from water! She's lost weight and is extremely stressed,I stupidly tried to force feed, it seemed time, at least while having a panic attack.. but she wouldn't open her mouth (I did this by gently but firmly holding her and rubbing the prey lightly by her mouth, she is too small to use a card.) I had no idea they could absorb that much water, had thought she'd eat more recently but found the worm shrunk under the heat, brown, hidden, as well as a couple other bugs I'd searched for but not found..
I'm leaving her alone for a day or too to recover from the stress. Not even trying to feed, just leave her in the dark and warm for while. Her room is also a quite one luckily.
I'll pick up a few crickets soon, can't afford to run out and get them now, petco wants like $7 a bag, but I'll get them in a day or two from a local shop, these are what she was fed in the store so I think they may stimulate her apatite.

I'm replacing her substrate with paper towel while I try to get her health up, lots of dark caves and a rock she can climb onto to dry off.
I'm not treating the tank with anything, I think just a good clean and removing the soil will take care of the infestation.