Human can talk

Redirected phonation from larynx to pharynx exercises to treat puberphonia.

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Move the hand and talk, aim to reduce strain on the vocal folds and improve vocal function by creating a controlled flow of air. These exercises can help with larynx dysfunction, hoarseness, and other voice problems. 

  Pharyngeal speech involves using the pharynx (the throat), vibration of uvula as a sound source by forcing air from the lungs up into the pharynx and then into the oral cavity and nasal cavity.The air is then modified by the tongue, lips, and other articulators to produce speech sounds. 

  Advantages are many. This is the trick knowingly or unknowingly many people follow and talk without strain for many hours.

Human have two cavities at right angles, and the tongue at the angle between the two able to affect their geometries relative to speech production.