There's no real definition for the terms. The yorkie standard says about the face:
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Small and rather flat on top, the skull not too prominent or round, the muzzle not too long, with the bite neither undershot nor overshot and teeth sound. Either scissors bite or level bite is acceptable. The nose is black. Eyes are medium in size and not too prominent; dark in color and sparkling with a sharp, intelligent expression. Eye rims are dark. Ears are small, V-shaped, carried erect and set not too far apart. Yorkshire Terrier Club of America |
Some breeds have really long muzzles or snouts, others have a flatter face; I've heard that Yorkies have more of a medium type of snout, but there is much variation. Some people use the term teddy bear to describe a small nose with a very fluffy hair face, much like a stuffed teddy bear. Others describe baby doll to mean short nose and wide set eye, and is often used along with the word teacup, meaning extra small, but this word has no real definition. As I said, since there is no real definition, it has no meaning and I would avoid breeders who use these terms as they are marketing terms not breeding terms. Look for breeders who are not just producing pets, but those who are improving the breed.