None. There is no legal requirement. Some people may not want to see you if you're not much good, but there is no cut-off point. Some famous ventriloquists such as Arthur Brough or Edgar Bergen have not been good at hiding their mouth movements. They got away with this because a) their characterisations were good and b) they were on the radio.
Ventriloquist makes about dos dollars a month
yes
Ventriloquist Cat was created in 1950.
That would be ventriloquist Chuck Field.
the first know ventriloquist that we really know of.
Jonathan Harrington - ventriloquist - was born in 1809.
Jonathan Harrington - ventriloquist - died in 1881.
Jimmy Nelson - ventriloquist - was born on 1928-12-15.
Keith Harris - ventriloquist - was born on 1947-09-21.
The Ventriloquist - 2012 I was released on: USA: 2 June 2012
A ventriloquist is a person who does puppets talented. Well, I don't really know what a ventriloquist is, but try using www.dictionary.com to find the definition. They'll probably have the definition.
Isn't it funny how ventriloquists can talk without moving their mouth