Icy Rocktor

The Icy Rocktor is a plug-bug that dwells within holes and tunnels, to block entrance into them, and harnesses the hazard of ice.

=In fanon games=

In Pikmin X: Deep Freeze
In Pikmin X: Deep Freeze, Icy Rocktors can be found blocking tunnels that Pikmin can dig through, and will try to scare them off by tossing snow around to freeze them solid. Rock Pikmin can shatter its crystal helmet and leave it stunned for a few seconds, preventing it from shielding itself by plugging up the hole.

In Pikmin: Shadows of the Future
The Icy Rocktor is exactly like other plug-bugs in Pikmin: Shadows of the Future; a strange, worm-like creature that wears a helmet made of rocks and lives inside cave entrances. A cave that is plugged up by a rocktor cannot be entered until the creature is defeated. The Icy Rocktor, if approached, will periodically cover its den with its ice helmet and scatter snowballs around by shaking itself. The snowballs will freeze all but Cyan Pikmin, so those are recommended for fighting these enemies. When defeated, the Rocktor's helmet shatters and it falls into the cave below, allowing access.