Thwomps, known as Dossun (ドッスン?) in Japan, are large stone blocks, depicted as having angry-looking faces and clenched teeth. First appearing in Super Mario Bros. 3, they drop onto people as they walk under them. Thwomps have also appeared in other games, including the Mario Kart series, at Bowser's Castle, Super Mario Karts Rainbow Road, and Mario Kart Wiis Thwomp Desert. The latter contains a Giant Thwomp which is replaced by a Giant Pokey for online tournaments. Thwomps make yet another appearance in Super Mario Galaxy. A smaller version called Thwimp appears in some games. They look exactly like Thwomps except for jumping from left to right. In Super Mario 3D Land,there are 2 kinds of Thwomps: regular Thwomps and the Tailed Thwomp.

Thwomps have appeared in both and The Adventures of Super Mario Bros. 3 and Super Mario World animated series.[37]

Thwomps have also appeared in some Legend of Zelda games.

In the 1993 motion picture, "Thwomp Stompers" are a pair of boots which grant wearers the ability to jump incredible heights.[citation needed]

GameDaily listed Thwomp as the 11th best Mario enemy.[38]