An East Side Kid

 

Stanley Clements (Stanislaw Klimowicz 1926-1981) was an American actor and comedian. While at Monogram Pictures, his nickname offscreen was "Stosh," but Clements adopted the nickname "Stash" for the ensemble-cast film series, East Side Kids, starring Leo Gorcey and Huntz Hall. When Gorcey left the East Side Kids in 1945, he and his teammate developed a new comedy gang series called The Bowery Boys. Because of personal tragedy and subsequent alcohol abuse, Gorcy was replaced by Clements as Stanislaus "Duke" Coveleskie in the final seven films, co-starring with Hall.

He appeared in numerous films in the 1940s and 1950s. His most famous role was as the uncredited teenage street-wise-turned-choirboy in the 1944 Bing Crosby Oscar winner, Going My Way, with some excellent comedic deliveries. (above with Carl Switzer) He had great success portraying a jockey in the 1945 Alan Ladd feature, Salty O'Rourke. He soon transitioned to television guest spots but small film roles were a staple into the late Seventies. 

A more complete filmography at https://wikimili.com/en/Stanley_Clements