Spiny Tromp

A Spiny Tromp is a large, "spiny", rock ball that has appeared several times in Super Paper Mario series of games. It is related to the normal Tromp of Paper Mario.

Spiny Tromp appears only in Super Paper Mario. In it, three different sizes of Spiny Tromps roll down hills/stairs, attempting to roll over anyone in their path. Mario can simply flip into 3-D and walk around them. In this game, they appear to be made out of three layers of what looks like cardboard.

Super Paper Mario
"This Spiny Tromp loves to roll down hills and over unlucky pedestrians... You can't beat it...  You can only avoid it...  It rolls down the hill fast, but I know Mario can find a way to avoid it..."