Golems are enemies that appear throughout the Shantae series.
Golems appear as enemies in the first game, belligerent obstacles in the second, and return to enemy status in the third. They don't appear particularly intelligent, but they are apparently the builders and masters of Golem Mine and have their own king. Since the same golem effigies that decorate the mine also adorn the mysterious floating pyramids high above the desert, among which are host to the ancient Spy Scope, it's likely they are an ancient race who are, or were once, quite advanced. Their natural enemy is the elephant transformation, which can shatter them with a single charge.
In Risky's Revenge, they demand not to be smashed. Naturally, the Elephant form is used to do just that to get them out of the way.
After a brief absence from Half-Genie Hero, these monsters return as traditional enemies. Their Monster Card increases the number of dropped gems when equipped.