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A Spiny Tromp is a large, spiked orb with a surly face; it bears a small resemblance to a circular Thwomp. Its name is likely derived from "trample", referring to their attacks, and "Thwomp". "Tromp" itself is also a slang word that can mean either "trample" or "ultimately destroy".
Spiny Tromps first appeared in Paper Mario, where they were found inside Mt. Lavalava; in a corridor of Mt. Lavalava, a Spiny Tromp would appear to try to crush Mario; Mario would need to use Bow's intangibility powers to avoid the Spiny Tromp. They were unnamed in this game, but it acts just like in Super Paper Mario, where it was named.
Later, another Spiny Tromp, after having its path cleared by Mario and his Ultra Hammer, would roll haphazardly towards Mario. Mario would once more need to use Lady Bow's ability to make himself intangible to avoid the rolling Spiny Tromp.
Unfortunately, the Spiny Tromp would continue to roll and crush the nearby Kolorado, injuring him severely; the Spiny Tromp would then blast its way through a nearby wall, clearing Mario's path before embedding itself in a wall.
Super Paper Mario
Despite their absence from Paper Mario: The Thousand-Year Door, several Spiny Tromps appeared in Super Paper Mario (in which they gained a name, since there was no given name in Paper Mario) as obstacles in the Mount Lineland and Underwhere Road, where they are shown to come in varying sizes. In order to dodge these Spiny Tromps, Mario would need to Flip, which reveals that Spiny Tromps are actually rather thin and composed of three layers of a spiked, cardboard-like substance, so they can still harm Mario while in 3D.
Names in other languages