Here's my quickly edited list from my PC's mothballs folder. Some descriptions lifted from IMDb etc. Sorry for any dupes!
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Allen Jenkins: "slow-witted gangster/taxi driver/etc". Boss's dumb underling, wisecracking mob henchman [Dead End, etc] "But, boss...!"
Percy Helton - Fat, hyper little guy, "hoarse, raspy voice and breathy delivery". [drunk Santa Claus on "Miracle on 34th street" etc]
Walter Tetley - Chubby, high pitched voice, always looked 15, did Sherman's voice on Bullwinkle show.
John Fiedler- High-pitched nervous voice, "12 Angry Men" etc
Robert Emhardt - Chubby, "Mayor" or politician types, on "Andy Griffith".
Burt Mustin - Tall, skinny, elderly gent on Mayberry ["Jud"] etc.
Eugene Pallette - "Gargantuan-bellied, frog-voiced character actor who was a staple in 1940s movies". [Young Tom Edison, Mr. Smith Goes to Washington, etc]
Byron Foulger - "Foulger's mustachioed, bespectacled, tremble-chinned, owlish countenance was one of the most familiar faces ever to grace the screen." Shopkeepers, "Andy Griffith Show" hotel clerk
Mary Wickes - Hawkish, wise-cracking, nosy-neighbor type, millions of old sitcoms.
Charles Halton, Thinning hair, rimless glasses, officious mannered weaselly attorney, played bank examiner in "It's a Wonderful Life",
Charles Lane
Charles Lane Mean, miserly sourpuss, real estate salesman on "It's a Wonderful Life".
Edward Brophy- "chubby, bald-headed face with pop-eyes", always the assistant for the 'Boss'. "Bald, rasping-voiced, cigar chewing, diminutive Hollywood character actor who specialized in playing gangsters, both in a comic or serious variety, at his peak during the 1930s and 1940s."
Thurston Hall- Gray, older, blustery, pompous exec/banker type, Topper's [TV] boss [Mr. Schuyler].