Rocky Mountain oysters are made from sheep's testicles not a horses. And they are typically deep fried.
Rocky Mountain Oysters - Bull testicles
They are the testicles of cattle or sheep.
Sheep 'balls" are called testicles; as are bovine "balls" and human "balls". "Balls" of the bovine persuasion, when prepared and cooked, are called Rocky Mountain Oysters, and sheep testicles are called "Shearer's oysters".
Try Rocky-Mountain Oysters! If you have any minors viewing this question, cover their eyes. Are they covered? Ok. Rocky-Mountain oysters are Sheep Testicles. Don't worry, they aren't raw. They are deep-fried. Here's what they look like...
Rocky Mountain Oysters - 2011 was released on: USA: 1 July 2011 (internet)
I believe it is Rocky Mountain Oysters.
Some traditional dishes that incorporate testicles as a food ingredient include Rocky Mountain oysters, also known as prairie oysters or calf fries, which are typically deep-fried and served as a delicacy in certain regions of the United States.
The Rocky Mountain Horse comes from the Rocky Mountains in the USA.
Rocky Mountain Oysters - 2011 Jailbird 3-1 was released on: USA: 26 November 2013
Rocky Mountain Oysters - 2011 Terminal 2-3 was released on: USA: 27 November 2012
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Rocky Mountain Oysters - 2011 Viagra Falls 1-6 was released on: USA: 11 December 2011