From the Super Mario Wiki, the Mario encyclopedia
Bamboo dancers are a subset of Spear Guys that do the Bamboo Dance. While Dancing Spear Guys jump around with spears, bamboo dancers always come in color-coded pairs and dance with limbo sticks. Their stick can trip Yoshis and lower their happiness, so it must be jumped over to avoid damage. During gameplay, one dancer is in the foreground while the other is in the background, making them invincible.
The artwork and sprites for bamboo dancers appear quite differently, as the sprites appear to be wearing yellow face paint and grass skirts in the same manner as Spear Guys, while the artwork depicts one with an unpainted mask and a much less leafy skirt. In addition, their shoes are green in the artwork instead of blue.
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