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