Nope. I'm quite sure though, that I once read a short article about "how to become a ventriloquist". And even tried pronouncing danana without lip movement. I recall b as being very lippy indeed.
But if I were a ventriloquist I would definitely build or buy myself a gigantic doll. I guess buy. I'm really not very good at building stuff, especially dolls. And I really do mean a giant big doll.
Instead of the more common act "man has hand in doll" I would go on stage with the somewhat more appealing and appalling "doll has hand in man". For the less imaginative of us, this would be an ideal place to envision a giant doll with his hand in a much smaller man.