I have an update on the situation: last week on Tuesday I bought some mineral oil and managed to syringe some into her mouth, which resulted in her passing some stool in a long, warm bath the next night, however the impaction was still there. I soaked her more the next day but she had passed all the mineral oil already.

In my search for better ways to give the oil I came across a user who had success in injecting a nightcrawler with mineral oil and feeding it to the frog. In brainstorming ways that I could deliver the mineral oil in a similar fashion, I searched for information on administering medication to frogs via gelatin capsule, but came up empty. I figured that since gelatin is made from animal material and dissolves quickly in water, plus is safe for humans, that it should theoretically be fine for frogs as well. Yesterday night I filled a small gel cap with mineral oil and formed some Pacman frog food around it and my frog snapped it up with no issues. Tonight, I gave my frog another long, warm bath and had great success; she passed most if not all of the impacted stool and is looking much more symmetrical. I'm pleased with how well the oil worked but I hope I'll never have to give this treatment to my poor frog again. I'll look into getting a stronger heat pad and give her more frequent more soaks so she'll stay regular from now on. I will say though, I'm impressed with how well she kept her weight on throughout this whole ordeal. It's clear she's lost some mass but still looks and feels like a normal weight, even with no water retention. I'll always be impressed with how hardy Pacman frogs can be!

I can't really say for sure whether mineral oil gelatin capsules are perfectly safe to use or not, but they worked well in my case, just in case anyone else has a hopelessly impacted frog and is desperately searching for ways to get it to poop.