I didn't think they would get lonely, I've read that American bullfrogs don't like being with other frogs. Not sure about Green frogs and how much they like being with other frogs, though I doubt it's any different.

Size difference was definitely worrying. Gnag's mouth could envelope Bumpy's legs with ease, and maybe half of her body. Glad that there is no possibility frog-eat-frog action now. I've heard of American bullfrogs taking down birds and bats, and I've seen more than one video of an adult American bullfrog hunting and then devouring a mouse only slightly smaller than it

I'm glad I did it, it might make things less stressful for both frogs- in Bumpy's case, once she settles down.
Food competition will no longer be an issue, either. And as for water changing, I've got that water conditioner now, so that'll be no problem. My only concern is the filter in Bumpy's tank, I'll need a larger and more powerful one eventually. Even so, it fits the bill for now.

Thanks for the advice, Brian