"These must be Kirby's evil twins. Their vacuum-like attack sucks up heroes and everything, but you can fight your way out into fresh air."
Link's Awakening guide

Anti-Kirbys are enemies from The Legend of Zelda: Link's Awakening. These enemies are based on Kirby, the protagonist of the Kirby series, also by Nintendo. However, unlike Kirby, who is friendly, Anti-Kirbys will attack Link on sight. They do so by sucking him into their mouths, and seemingly attack Link while he is inside them, similar to how Kirby can inhale enemies in most Kirby games. They appear only in Eagle's Tower and are immune to sword attacks. However, they can be defeated if they are tricked into inhaling Bombs. The Kirby 20th Anniversary Celebration Book states that Kirby made a guest appearance in The Legend of Zelda: Link's Awakening; this refers to Anti-Kirby.