Don’t let the the word “oyster” in “Rocky Mountain oyster” sucker you into thinking it’s a briny bivalve. When it comes to these “oysters”( also known as Prairie Oysters ), seafood is not involved.
In fact this dish originated in the North American West, far from any ocean. Generated by ranchers, Rocky Mountain oysters are in fact, most famously, bullshit testicles. Though sheep, bison and boar can be used, too.