"Small Fry" is an American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 popular song written in 1938 by Hoagy Carmichael

Hoagy Carmichael

Howard Hoagland "Hoagy" Carmichael was an American composer, pianist, singer, actor, and bandleader. He is best known for writing "Stardust", "Georgia On My Mind", "The Nearness of You", and "Heart and Soul", four of the most-recorded American songs of all time.Alec Wilder, in his study of the...

 and Frank Loesser

Frank Loesser

Frank Henry Loesser was an American songwriter who wrote the lyrics and scores to the Broadway hits Guys and Dolls and How To Succeed In Business Without Really Trying, among others. He won separate Tony Awards for the music and lyrics in both shows, as well as sharing the Pulitzer Prize for...

. It was first sung and introduced by Bing Crosby

Bing Crosby

Harry Lillis "Bing" Crosby was an American singer and actor. Crosby's trademark bass-baritone voice made him one of the best-selling recording artists of the 20th century, with over half a billion records in circulation....

, in the film Sing You Sinners

Sing You Sinners (1938 film)

Sing You Sinners is a 1938 black-and-white American musical comedy film starring Bing Crosby, Fred MacMurray, Donald O'Connor, and Ellen Drew. The movie was written by Claude Binyon and directed by Wesley Ruggles...

(1938). In the film, Crosby sings it in a musical sequence with a young Donald O'Connor

Donald O'Connor

Donald David Dixon Ronald O’Connor was an American dancer, singer, and actor who came to fame in a series of movies in which he co-starred alternately with Gloria Jean, Peggy Ryan, and Francis the Talking Mule...

 and Fred MacMurray

Fred MacMurray

Frederick Martin "Fred" MacMurray was an American actor who appeared in more than 100 movies and a successful television series during a career that spanned nearly a half-century, from 1930 to the 1970s....

. Crosby made a 1938 hit record of the song with Johnny Mercer

Johnny Mercer

John Herndon "Johnny" Mercer was an American lyricist, songwriter and singer. He is best known as a lyricist, but he also composed music. He was also a popular singer who recorded his own songs as well as those written by others...

 dueting. He also recorded a solo version of the song for VDisc in the 1940s.

There was a Fleisher cartoon in 1939 that used the song "Small Fry" to portray a story behind the song as a warning to youngsters to not want to grow up too quickly.
http://www.imdb.com/title/tt0031936/