Which cartoon character was originally called Egghead?

Tex Avery was an American animator and director, known for producing and directing animated cartoons during the golden age of American animation. He introduced a new character in his cartoon short "Egghead Rides Again", released July 17, 1937. Egghead initially was depicted as having a bulbous nose, funny/eccentric clothing, a voice like Joe Penner (provided either by radio mimic Danny Webb or actor Cliff Nazarro) and an egg-shaped head. Many cartoon historians believe that Egghead evolved into Elmer J. Fudd over a period of a couple of years.

In 1940, Egghead–Elmer's appearance was refined, giving him a chin and a less bulbous nose (although still wearing Egghead's clothing) and Arthur Q. Bryan's "Dan McFoo" voice in what most people consider Elmer Fudd's first true appearance: a Chuck Jones short entitled "Elmer's Candid Camera".

Elmer J. Fudd is a fictional cartoon character in the Warner Bros. Looney Tunes/Merrie Melodies series, and an adversary of Bugs Bunny. He has one of the more disputed origins in the Warner Bros. cartoon pantheon (second only to Bugs himself). His aim is to hunt Bugs, but he usually ends up seriously injuring himself and other antagonizing characters. He speaks in an unusual way, replacing his Rs and Ls with Ws, so he always refers to Bugs Bunny as a "scwewy wabbit". Elmer's signature catchphrase is, "Shhh. Be vewy vewy quiet, I'm hunting wabbits", as well as his trademark laughter.