The term "cross fox" is used to describe a red fox that has a dark cross marking on its back. However, there are several other terms that are synonymous with "cross fox". One of the most common is "red fox phase". This term is used to describe the color phase of a red fox that has a cross marking on its back. Other synonyms for cross fox include "silver fox", "black fox", and "cinnamon fox". These terms are used to describe red foxes that have different color variations, including silver, black, and cinnamon hues. Regardless of the terminology used, cross foxes are a beautiful and unique subspecies of the red fox.