The only way a ventriloquist speaks differently is that he forgoes using his or her lips, and learns to reproduce sounds using the tongue, upper palate, and teeth only. Those 'difficult' letters are B, F, M, P, V, W, and Y.
Jeff DunhamWhen I was in third grade I taught myself ventriloquism... What's hard is to learn to be an entertainer and make people laugh. I was a few years out of college before I felt I had enough material. Then in 1988 I moved to L.A. and started to do some shows at comedy clubs.
Jeff Dunham