Dragon Fang Warriors

Familiars made from dragon teeth.
The teeth are planted in the ground, where they become disposable soldiers imbued with the magical energy of dragons and knowledge from the earth.
Going by sprites it seems that there are three types, and they're all lovely.
A nostalgic existence for those experienced with tabletop role-playing games. They're actually very strong, and if a group of level five adventurers picks a fight with them they're in for a rude awakening.

Fate/side material: Fate Encyclopedia