the.com/ventriloquism

means The skill of speaking without visibly moving your lips so the sound seems to come from somewhere—or someone—else.

from From Latin venter (belly) plus loqui (to speak) — literally 'belly-speaking.' The word reflects an old belief, going back to ancient Greece, that the sound was produced by spirits or voices rumbling in the speaker's stomach rather than their throat. The Greeks even had a term for it, engastrimythos, meaning the same thing. Only later did people understand it's really a trick of controlled breath and misdirected lips, not digestion.