From the Super Mario Wiki
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Limbo Guys are a subset of Spear Guys that live on a small island near Yoshi's Island and prefer to always play "limbo" with passerbys. While Dancing Spear Guys jump around, the invincible Limbo Guys come in color-coded pairs and "dance" with limbo sticks. They can trip Yoshis by aggressively dancing around with their stick, so the stick must be jumped over to evade damage.