Slowing metabolism for a few hours is not too big a deal, but the adaptations to survive stomach acids maybe is? Frogs eat all manners of arthropods whole, without macerating, so whatever's down there is pretty aggressive.

>It can't be "dank" if it's entirely liquid filled, come on.

'disagreeably damp, musty, and typically cold.'

I imagine I'd describe visiting a predators GI tract as 'disagreeably damp', among other things.

An aside : I agree that I haven't heard it used in the context of submerging, but the definition seems to allot for it?

I wouldn't expect a "dank basement" to require SCUBA gear. I agree with GP that this word use struck me as odd and distracting. Not sure what I expected to read about a beetle navigating an intestinal tract, but still.

But probably not very cold, or musty for that matter.

And "damp" would only be used ironically to describe an entirely aqueous environment. "Hmm, I don't like the ocean, it's a bit damp."