There are two types of variations with Pomeranians: the face and the size. Neither type of variety is formally acknowledged, and both present their own problems.
Of the three face varietals, only one is semi-official by AKC and other renowned kennel clubs: the fox face. This is because the breed standard calls for this kind of face, and as such, it's implicitly acknowledged. By proxy, this implies that there are non-fox faced Pomeranians. Still, that doesn't mean the other two kinds of Poms are equally acknowledged. These two other types, the "teddy bear" and the "baby doll," are most likely marketing terms. One of them is even the same as a typical dog hair cut, and this " teddy bear face" can actually be styled by a groomer!
If you're curious about coat varieties, there are none with the Pom breed. You may hear or see of a Pom called a Teddy Bear Pom because of the coat styling, but this is not a true style but a grooming feature.
When it comes to size variations, Poms are already a Toy breed. This means that the typical size variety names can be confusing. Some backyard breeders (BYBs) will label their puppies "Toy Poms," and this is simply silly as all Poms are Toys. Then there are the so-called miniatures (or mini), micro, teacup, boo, pocket, etc. These dogs tend to have a great many serious health problems due to downsizing that harms the dog, or because runts are used for breeding even smaller dogs. Another serious problem is when dwarfism is ignored and the dogs are used to breed ever-smaller Pomeranians. Sometimes called the spitz nain pomeranien, such dogs are to be avoided.