The Doors Examined
author Jim Cherry offered a unique interpretation of the song in his interview with Songfacts
"I think it's misunderstood," Cherry said. "In 'Peace Frog,' he mentions three cities: Venice, New Haven, and Chicago. The general assumption was that the song is primarily political, and the Chicago reference is about the 1968 riots. Jim wasn't there, though, when those riots happened in 1968. The other references, though, are clearly about his personal life.
Venice, California, is where he went on the rooftop and dropped all that acid that led to a lot of his poetry and the early Doors music. New Haven, Connecticut, was where he first started getting arrested and experiencing trouble on stage. So that nails the first two as autobiographical references. So why wouldn't Chicago be autobiographical? Well, sure enough, if you look at his biography, May or maybe June of '68 was when Morrison first went onstage with the conscious intention of provoking a riot.
That's why I think Morrison's lyrics in general, and in 'Peace Frog' in particular, are more autobiographical than people think."