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Baseball Boys refers to a pair of enemies appearing in Super Mario World 2: Yoshi's Island, with clear relation to Zeus Guys and Bandits. Aside from the physical similarities to those two enemies, Baseball Boys specifically operate using baseball equipment. They often appear in groups of two or more.
Grunts also greatly resemble the members of the Baseball Boys.
Baseball Boys are similar to Chargin' Chucks, who appear in Super Mario World, in some respects. Both groups appear to be athletes of an American sport, and both take three jumps to defeat. Also, Yoshi can't use his tongue against the two groups either.