Here are the colors from the AKC breed standard:
Color: Acceptable colors - All brindle, fawn, white, brindle and white, and any color except
those which constitute disqualification. All colors are acceptable with the exception of solid
black, mouse, liver, black and tan, black and white, and white with black, which are
disqualifications. Black means black without a trace of brindle.
Of course you can purchase any dog you like. It's just that this colored frenchie will not be a purebred. There is a mix in there somewhere and that is what is giving him his color. If that is what you love, then you should go for it. Also, be aware that his ears look so huge because he is a puppy. Frenchie ears are big - and adorable!!! - however, their ears are bigger when they are puppies. They "grow into" their ears as they mature and their heads and bodies get bigger.
Good luck.