From the Super Mario Wiki
First appearance Yoshi's Woolly World (2015)
Latest appearance Poochy & Yoshi's Woolly World (2017)

Snag-Stitches are metal-like enemies that first appear in Yoshi's Woolly World. They damage Yoshi on contact, and are found moving either left and right, up and down, or in a circled path. They cannot be defeated but they can be stunned by throwing a Yarn Ball at it in which they'll become a platform for the player to use for a short time before it breaks free.

Snag-Stitches only appear in the course, Snag-Stitch Mountain.

Names in other languages[edit]

Language Name Meaning
Japanese コワモテさん[1]
Mr. Hard-Faced
Korean 험상씨
Mr. Hard-Faced; 험상궂다 is a word used to describe something rough in exterior.