A tri color Frenchie is a more atypical coat coloration on a French bulldog. Usually, they come in solid colors or brindle patterns. But there are exceptions and selective breeding can result in certain recessive genes diluting the initial colors and mixing more than two.
Thus a French bulldog is obtained with three colors in very unique patterns and markings. Dogs with interesting features are always most prized by owners, and the same is true for tri colored French bulldogs.