Dancing Spear Guy
From the Super Mario Wiki
Dancing Spear Guys are a type of Spear Guys that first appeared in Super Mario World 2: Yoshi's Island. They dance to move, forcing Yoshi to evade their spears. Due to their movement pattern and the size of their spears, it is tough for the dinosaur to jump over them. They are edible, however, so Yoshi can simply swallow them. They are smaller than normal Spear Guys, without counting the spear. They also lack the shield and the feather held by a Spear Guy, and are a shade of yellow instead of red. The spear of the Dancing Spear Guy is taller than the spear of the normal Spear Guy.
They reappear in Yoshi's Island DS. They now have a greener shade on their masks (every other Shy Guy appearing in Super Mario World 2: Yoshi's Island had their palette changed to blue) and they move differently. They hop when moving, and after every hop, they make a circle and jump in height, then they hop again to move. They also grow in size. However, they are still smaller than regular Spear Guys, have a slightly longer spear than a Spear Guy and lack the feather and shield.
Chuck Guys from Mario & Luigi: Superstar Saga behave similar to Dancing Shy Guys, but instead of being harder to avoid, they make a call to others. There are also similar dancing Shy Guy pairs, the Bamboo Dancers, which made their appearance in Yoshi's Story.
Dancing Spear Guys make an appearance in Mario Party 4; however, they hold torches instead of spears.
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