Dean and Frank sing together “A Marshmallow World” live in a Christmas edition of Dean’s TV show (December 21st, 1967).

A Marshmallow World” (sometimes called “It’s a Marshmallow World“) is a popular song that was written in 1949.
The song is about winter and is commonly regarded as a Christmas song, although the lyrics make no mention of the holiday.The song was first a hit for Bing Crosby (backed by the Lee Gordon Singers and Sonny Burke and his Orchestra). Crosby’s version, recorded in 1950,peaked at number 24 on the pop singles chart in January 1951.
Other artists who recorded the song in 1950 included Ray Anthony, Vic Damone, Johnny Desmond, Arthur Godfrey, Vaughn Monroe, Brenda Lee and Dean Martin.