Can dumb people speak in ventriloquism?

You can't. Abdominal language is not really talking with the stomach, but it has changed the way of speaking after some training. Dumb people can't speak in ventriloquism. When they speak ventriloquism, after training, they can make sounds when their jaws are closed or even their lips are closed. This pronunciation process needs training and skills, and it can be said that it can be completed only by relying on the tongue. When people speak normally, especially when singing, they should use their mouths to vibrate their voices. On the other hand, when speaking in a low voice, I am afraid that others will hear me, so I only use vocal cords for pronunciation to minimize oral vibration. Another way is to sing in falsetto, such as singing folk songs in northern Shaanxi, which is another way to pronounce with sound. The folk artists mentioned above use two kinds of sounds (perhaps with whistles) and get wonderful artistic effects. Abdominal language, on the other hand, swallows words into the stomach, makes sounds vibrate in the abdominal cavity, and lets you hear ambiguous sounds through the stomach.