Kris Kross recorded the "Rugrats Rap" for Rugrats and for Nickelodeon; it was released as a single in 1992 on their debut album Totally Krossed Out and released in 1994 as extras on some Nickelodeon VHS tapes, and was finally released on CD in 1998, on The Best of Nicktoons CD. The "Rugrats Rap" made its official radio airplay debut and is available on the Rugrats Chuckie the Brave VHS, Harriet the Spy VHS, The Best of Nicktoons CD (which is a compilation album of theme songs and other material from several Nicktoons that was released by Nickelodeon and Warner Bros. Records in 1998), Rugrats: Decade in Diapers Collectors Edition DVD, and YouTube. The group separated some time after their third album and went on to solo careers. Kelly and Smith began writing and producing albums.
Read more about Kriss Kross here.