Who always said yellow bellied sap sucker was it barney on the mayberry rfd?

In the Classic Television series "The Andy Griffith Show," the character known for using the term "yellow-bellied sap sucker" is actually the character of Gomer Pyle, played by Jim Nabors. Gomer often used this phrase as a humorous insult. Although "Mayberry R.F.D." is a spin-off of "The Andy Griffith Show," the term is more closely associated with Gomer's character in the original series. Barney Fife, played by Don Knotts, did not commonly use this phrase.