Molly Moo-Cow was the name of an animated character appearing in Rainbow Parade shorts produced by the Van Beuren Studios in the 1930s.
This series was sold to Commonwealth Pictures in 1941 and was later syndicated for television. Some of these can be found in inexpensive DVD collections of public domain cartoons
Molly Moo-Cow liks Robinson Crus
Molly Moo-Cow with the Butterflies