Buffalo Bob Smith and Howdy Doody
Contestants in the 1948 gameshow program, Who's That Girl?
Dummy Ventriloquist Mashup
This is the only one in the list that isn't a genuine act, but rather a mashup by Aeron over at Eaten By Ducks. However, it so perfectly captures everything that is malevolent about vintage ventriloquy that I felt impelled to include it.
Extremely Upsetting Edwardian Ventriloquist
Henry Rox with Matt
Popsy A Simply Made Dummy for the Amateur Ventriloquist
Publicity Stills (unidentified) Circa 1945 Collection Jim Linderman
The Ventriloquist who refused to be a stripper
Thora a Victorian Transvestite Ventriloquist