The amphibious swamp monster lives in a bog.
History
The Richie Rich/Scooby-Doo Show
Season one
It chased Scooby-Doo, Scrappy-Doo, and Shaggy Rogers when they went fishing in its swamp. Eventually they trapped it on the paddle wheel of an abandoned riverboat and it was carried off into the distance. (Soggy Bog Scooby)