Peace Frog is a rock composition written by Jim Morrison and Robby Krieger for The Doors' 1970 album Morrison Hotel. The song originated when Krieger developed a propulsive guitar riff and brought it to the band. Morrison, who was absent during the initial sessions, had separately written a poem titled "Peace Frog" in his notebook. The other three Doors members discovered the poem and married it to Krieger's musical idea, producing a collaboration that merged Morrison's incantatory lyrical style with the band's rhythmic intensity. The composition is built on a hypnotic, driving groove anchored by a stark melodic hook and Morrison's repeated vocal phrase "she came," which recurs throughout the piece with an almost ritualistic insistence. Harmonically, the song relies on blues-inflected diatonic chord structures, placing emphasis on rhythmic momentum rather than harmonic complexity. The guitar, keyboards, and rhythm section interlock to create a relentless forward motion that builds tension through persistence and repetition. On the original album, the track segues directly into the ballad "Blue Sunday," creating a striking juxtaposition of intensity and tenderness. The composition reflects Morrison's experiences living in Venice, California, and draws on the visionary, poetic imagery that characterized his writing during this period. It has remained a notable deep cut in The Doors' catalog, with Robby Krieger and Smashmouth later recording a version for the 2000 tribute album Stoned Immaculate.