Magmaw

Magmaws are a species of Blarggs in Super Mario Galaxy 2 found exclusively in the Melty Monster Galaxy. Magmaws live in lava and attack by opening their mouths and passing through asteroids that the player may be on. They seem to be mostly liquid because small objects such as meteors can pass through their body. Much like their larger counterparts, Magmaarghs, they cannot be defeated.

Trivia

 * Magmaws bear a slight resemblance to Bogmire from Luigi's Mansion, both in appearance and in the sounds they make.
 * The word "Magmaw" is a combination of the words "magma" and "maw".