From Muppet Wiki

The Busby Twins are identical twin boys named Moe and Joe Busby. On Sesame Street episodes from the 1970s, they were known to share each others' sentences, each one speaking a word at a time, often confusing people they meet. Though their tenure on the show was brief, they continued to appear in books through the 1980s.

Book appearances

• The Sesame Street 1, 2, 3 Storybook (1973)
• The Sesame Street Dictionary (1980)
• I Think That It Is Wonderful (1984)
• The Sesame Street ABC Book of Words (1988)

a Busby Twin