
Walter Brennan
Walter Andrew Brennan (July 25, 1894 – September 21, 1974) was an American actor and singer. He won the Academy Award for Best Supporting Actor for his performances in Come and Get It (1936), Kentucky (1938), and The Westerner (1940), making him one of only three male actors to win three Academy Awards. Brennan was also nominated for his performance in Sergeant York (1941). Other noteworthy performances were in To Have and Have Not (1944), My Darling Clementine (1946), Red River (1948), and Rio Bravo (1959). Description above from the Wikipedia article Walter Brennan, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Movies

Sergeant York
1941
as Pastor Rosier Pile

Dakota
1945
as Bounce of the Riverbird

Red River
1948
as 'Groot' Nadine

Rio Bravo
1959
as Stumpy

My Darling Clementine
1946
as Old Man Clanton

Fury
1936
as Bugs Meyers