<Table> Rocky Mountain oysters <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Alternative names </Th> <Td> Prairie oysters, calf fries, cowboy oysters, </Td> </Tr> <Tr> <Th> Course </Th> <Td> Hors d'oeuvre </Td> </Tr> <Tr> <Th> Place of origin </Th> <Td> Canada and United States </Td> </Tr> <Tr> <Th> Main ingredients </Th> <Td> Testicles (bull calf), flour, pepper and, salt </Td> </Tr> <Tr> <Td_colspan="2"> Cookbook: Rocky Mountain oysters Media: Rocky Mountain oysters </Td> </Tr> </Table> <Tr> <Th> Alternative names </Th> <Td> Prairie oysters, calf fries, cowboy oysters, </Td> </Tr> <Tr> <Th> Course </Th> <Td> Hors d'oeuvre </Td> </Tr> <Tr> <Th> Place of origin </Th> <Td> Canada and United States </Td> </Tr>

Where did the name rocky mountain oysters come from