French Dolls are creepy possessed dolls. They float in the air and make passes at the hero.
The first French Dolls appeared in the Floating Corridor (Block 6) of Castlevania Chronicles. They first appear lying on the floor, but as Simon approaches, they stand up, hold their skirts with both hands and perform a reverence, then they float around, make some unpredictable movements, and sometimes dash back to avoid being hit with the whip.
French Dolls later appeared as enemies that are fought during the battle with the Puppet Master in Dawn of Sorrow and Harmony of Despair. The Puppet Master can create infinite French Dolls from his mouth. If the player is not careful, they can overwhelm them in numbers. However, their main purpose is to distract the hero from the Puppet Master's main attack, which consists in placing a puppet inside an iron maiden and then switching it with the hero.