From Video Game Music Preservation Foundation Wiki
Bullfrog was composed by Bobby Prince for the game Commander Keen IV: Secret of the Oracle (DOS). The song was composed using Sequencer Plus Gold and was written from the ground up for the Sound Blaster FM synthesizer. The song was not used in the final version of the game.
The song was named "bullfrog" in the archive supplied by John Romero, but the whether this is the complete official title is not known.