What sort of person is described as literally "speaking with their stomach"?

The phrase "speaking with their stomach" is best associated with a ventriloquist. A ventriloquist is an entertainer who uses a dummy or puppet to perform, creating the illusion that the puppet is the one speaking. This art form often involves projecting one's voice in such a way that it appears to come from the puppet rather than the performer, which can be interpreted as "speaking from the stomach" because ventriloquists often rely on their diaphragm to produce the voice for their puppet.

In contrast, an orator, elocutionist, and lecturer are all primarily focused on speech delivery by themselves and do not involve the use of a dummy or external object that “speaks.” Each of these roles emphasizes clarity, expression, and the power of spoken word, but lacks the unique performance aspect of ventriloquism that lends itself to the figurative description of speaking through another figure.