Glorpedo

Glorpedoes, also known as Iga, are large lumpy balls of goop that leave behind more goop as they move.

Super Mario Sunshine
Glorpedoes are first found in Super Mario Sunshine. Brown ones first appear as projectiles launched by Petey Piranha, both leading up to the first battle with him and while he is flying during the second battle with him. In both of these cases, they turn into a large splat of goop, which spawns Swoopin' Stus. Orange ones later appear in Noki Bay, where a Monty Mole shoots them out of his cannon. Here, they roll and bounce swiftly down the cliffs, leaving a trail of goop and spawning Swoopin' Stus in their wake. Eventually, they hit the ground with a large splat, much like the ones Petey shoots, creating a large puddle of goop at the bottom of the cliffs.

Like Piranhabons, Glorpedoes roll right over Mario without stopping if he is in their way. However, spraying them with FLUDD causes them to expand until they burst, releasing the sprayed water all around them and occasionally leaving Water Bottles behind. Jumping on top of them creates a very large puddle of goop.

Mario & Luigi: Paper Jam
In Mario & Luigi: Paper Jam, Petey again shoots brown Glorpedos during his battle, where they appear in the "running away" sequence. He spits them to roll after Mario or Luigi, with the one he aims for being telegraphed by the arm Petey waves beforehand. They can be jumped over with help from Paper Mario's Airplane Guard. As they roll, they shrink down into a streak of harmless goop.

Other appearances and references
In Mario Golf: Toadstool Tour's leaderboard, it is possible for the name "Glorpedo" to appear.