Happy Harmonies (1936-1937 Season) #8: Bosko and the Cannibals (1937)
Bosko is on his way to give a bag of cookies to Grandma when he gets stopped by a frog that sounds like Louis Armstrong. He and other frog caricatures of famous African-American musicians like Fats Waller, Cab Calloway, and Bill "Bojangles" Robinson are portrayed as cannibals.