Glorpedo

From the Super Mario Wiki

Glorpedoes are goopy balls that Monty Mole shot out of his cannon whilst polluting Noki Bay during the events of Super Mario Sunshine. Much like Piranhabons, Glorpedoes would roll swiftly down the cliffs of Noki Bay, leaving a trail of Goop and spawning Swoopin' Stu in their wake. Eventually, they would hit the ground with a large splat, creating a large puddle of Goop at the bottom of the cliffs.

Like Piranhabons, Glorpedoes would roll right over Mario without stopping if he was in their way. However, spraying them with FLUDD would cause them to expand until they burst, releasing the water around them. Jumping on them is ill-advised, as doing so would create a very large puddle of Goop.

[edit] Trivia

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