Rock Cornish is a term used to describe a breed of chicken that is a cross between a Cornish and Plymouth Rock chicken. However, there are several other names that can be used to refer to this type of chicken. Some of the synonyms for Rock Cornish include Cornish Game Hen, Rock Game Hen, and simply Game Hen. These names are often used interchangeably, but they all refer to the same breed of chicken. Regardless of the name used, Rock Cornish chickens are known for their small size and tender, flavorful meat, making them a popular choice for many recipes.