vent figure
n.— «Klein, who lives in Nanticoke, is a trained ventriloquist. She and her puppets, or “vent figures” as they are called in the trade, perform for kids and adults throughout the area.» —“A woman’s love of ventriloquism” by Kristen Gaydos Citizens’ Voice (Wilkes-Barre, Pennsylvania) Sept. 1, 2008. (source: Double-Tongued Dictionary)