The story
Possibly based on similar terms used by American novelist Charles Brockden Brown (1771-1810) in Wieland, or the Transformation: An American Tale (1798) and Memoirs of Carwin the Biloquist (1805).
Etymology from Wiktionary, CC BY-SA 4.0.
biloquism
Today it means: The ability to speak in two different voices, especially as a ventriloquist. Full definition →