Mini/Buffyverse

Misspellings from either Buffy the Vampire Slayer or Angel create mini-trolls. Mini-trolls are short, green-skinned humanoids with horns on their heads. These minis are speech capable.

Mini-trolls originally appeared at the Official Buffy and Angel Fanfiction University, which has been deleted. Fortunately, they do have some surviving appearances as OFU staff in the spin-off of Agents Rhysdux and Honorificus. (After all, HonorH is the author of OBAFU.)

Canon Origin
The season five episode of Buffy, "Triangle" features a troll named Olaf. Back in Viking times, Olaf had been a human troll hunter. His lover (the future Scooby Anya) cursed him with the body of a troll due to Olaf's unfaithfulness. Centuries later, Anya inadvertently freed him from a magic crystal, allowing him to make trouble throughout Sunnydale.

Trolls have green skin, horns on their forehead and super strength. Humans can be turned into them. And that's pretty much all we know about Buffyverse trolls.

Minis

 * Buffys
 * Summer
 * Kennady
 * Merick