* Troll dolls: These are probably the most well-known and iconic dolls with this hairstyle.
* Novelty dolls: A broad term that can be used if the doll's hair is part of a unique or quirky design.
You might also describe them more generally as:
* Dolls with upright hair
* Dolls with spiky hair
* Dolls with gravity-defying hair
* Wild-haired dolls
Ultimately, the best term to use will depend on the specific doll you're describing and the context in which you're using the term.