Questions for running on Steam Deck

Hey! Sorry for the late reply, we mainly use the discord and don't often check the website much.

To run on the Steam Deck, presumably you'll need Windows (unless you're using Proton, in which case I don't think anyone has documented how to do that before.)

For running Frogger: He's Back, there's a guide on the website, same with Frogger: The Great Quest.
Frogger Beyond will work out of the box with no changes.
Frogger 2: Swampy's Revenge has a special patched version in our discord server which fixes a lot of issues.
Frogger's Adventures: The Rescue has a patch somewhere linked on the forums here which fixes the PC port.
There's also the Frogger Ancient Shadow PC port, which is available here too. (It was considered lost media for years, so the only way to play it is using the version here)

Alternatively, emulators such as Dolphin will get you really far too, since if the PC ports are difficult to get working, sometimes emulators can be simpler to setup.