Speargrub

The Speargrub is a spiked mandiblard that travels through various holes in walls, which it can crawl along with ease. Speargrubs are rather oblivious to leaders and Pikmin even if they are in the Speargrub's way, which can result in them getting injured by the Speargrub's spikes.

=In fanon games=

In Pikmin: Decayed Leaf
The Sporegrub is a returning enemy appearing in Pikmin: Decayed Leaf. The small creature resembles its appearance in. The Sporegrub can be found in old tree trunks, dirt, walls above ground, or mainly, walls underground. They will appear between two different hole points in a wall or in the ground and slowly move between each point; falling into the hole and popping out of the next one. The Sporegrub is completely invincible to any Pikmin attacks due to its spikes. The Sporegrub never stops moving; and cannot be killed through anything except bomb rocks. It is best to simply avoid the Sporegrub, as trying to attack it will result in failure; and potential Pikmin deaths.