From the Super Mario Wiki

The title of this article is official, but it comes from a non-English source. If an official name from an English source is found, the article should be moved to its appropriate title.

First appearance Donkey Kong (1994)
Parent species Thwomp
Related species
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Ussun are walking stone creatures resembling Thwimps found in Donkey Kong for the Game Boy. They first appear in Stage 3-1 on the Ship. Ussun slowly walks horizontally, including across spikes. Mario can jump onto them to cross larger areas of spikes. Ussun do not hurt Mario in any way, although they do sometimes block his path.

Names in other languages[edit]

Language Name Meaning
Japanese ウッスン[1]
From the Japanese name for Thwomps, "Dossun".