From Muppet Wiki

Johnny Carson (1925-2005) was the host of The Tonight Show from 1962 to 1992.

In the 1960s, Jim Henson drew up a proposal for a Muppet special that would have been hosted by Carson, but the project never materialized.

In 1971, Carson appeared on Pure Goldie, a Goldie Hawn TV special that also featured Kermit the Frog.

Kermit and the Muppets guest-hosted an episode of The Tonight Show on April 2, 1979, as a promotion for The Muppet Movie.

Carson was also a frequent host of the Academy Awards, where he once famously conversed with Miss Piggy about her failure to garner a Best Actress Nomination for her work in The Great Muppet Caper.

Carson and Henson were inducted into the Television Academy Hall of Fame in the same ceremony, in 1987.