Batrachian Swamps by Micah Anderson and Nate Treme

"Twisting channels of murky water. Soggy fractals of rotten plant matter and black soil. The whine of mosquitos and swoops of bats. A heavy grey sky, like a humid woollen blanket. And over it all, the dumb, accusing stare of amphibians."

A fetid hexcrawl, probably compatible with your favourite tabletop role-playing game. Includes a keyed hex map, random encounters, loot, NPCs, and a pre-made dungeon.