Magmaargh

Magmaarghs are a sub-species of Blarggs that only appear in Super Mario Galaxy 2. They appear mostly in Melty Monster Galaxy, being the titular monster. They appear as large molten creatures with a huge mouth. They also appear in Fleet Glide Galaxy and Bowser's Galaxy Generator. Magmaarghs do not move very much, mostly staying under the lava, arising to chomp down on anything in front of them. If Mario or Luigi gets chomped he loses one wedge of health. In the Melty Monster Galaxy, they appear mostly where there are Pull Stars. In Bowser's Galaxy Generator, 3 of them appear during the Snake Block section. Here, the Snake Blocks split into 2 paths, where there is one Magmaargh per path and when the Snake Blocks come back together, one last one appears, where Mario (on Yoshi) must swallow a nearby Blimp Fruit to pass over the monstrous creature. Just like their relative the Magmaw, they seem to be mostly liquid, because they can pass through solid objects.