Are there any cartoon characters that stutter?
The adored pig from Looney Tunes, Porky Pig, has a stutter. It has been found that he stutters 23% of his spoken words and uses a wide variety of stuttering types. The story goes that his father was a severe stutterer, and thus Porky Pig was predisposed to this kind of speech at an early age. Shows depict Porky Pig as having experienced a range of traumas (i.e. being plagued by termites, talking to a giant, and serving as a private in the French Foreign Legion). While the show does not pay attention to the accuracy of stuttering, it does relate the impact of previous trauma to stuttering. In spite of his stuttering, Porky Pig achieves success in numerous jobs including a farmer, sailor, railroad engineer, pilot, newscaster, and a police officer.
https://www.mnsu.edu/comdis/kuster/gjohnson/ppig.html