There are at least two artists with the name John Frum:

1) From JAHTARI.ORG:

The Dub-pseudonym of Julien Neto, our mysterious man from France. Dub agent,
delay pilot and spring reverb navigata, long time friend and fellow Jahtarian
since years who's producing tracks upon tracks that are the manifestation of
deepness itself. After two huge depth charges on our very first Jahtari 12",
"JAHTARIAN DUBBERS" Mr. Frum is back at the controls with another off-the-
scale shuffler on "JAHTARIAN DUBBERS Vol. 2". And stay tuned for a lot more niceness to come!

While you're at it don't forget to check his brilliant ambient album
on Typerecords, 'LE FUMER DE CIEL'! "

2) The patron saints of altered states known as John Frum began its chronicle of disturbances on 11.11.11 in Philadelphia, and have been fermenting their bedeviled broth in the clandestine corners of their collective consciousness ever since.

John Frum borrows its name from a relatively isolated group of natives in the South Pacific islands, known as a Cargo Cult, who first used the alias John Frum as a means to reject European ways, escape oppressive missionaries, and return to their old traditions. The narrative changed, during the war in the 1940s, to reflect their encounters with thousands of American soldiers who spectacularly descended on that region by sea and air with crates of wartime materials dropped from the sky, known as “Cargo.” These events drastically changed the beliefs and lifestyle of the islanders as they took the soldiers and their offerings to be god-like, as they descended from the heavens.

Alt-religious narratives induced by these encounters were incongruent with islanders’ long-held beliefs, yet the natives could not deny the call of the cargo. Attempting to reconcile their existing beliefs with the new understanding of the outside world led to some strange interpretations which evolved into a bizarre narrative about a dark-skinned soldier-deity who resides inside a nearby volcano, and who many believe will one day return, showering them in riches and technology.

Like a planchette moved by the presence of subtle energies, John Frum functions as a medium for malefic musings. Existing at the intersections of perception, superstition, intoxication, ritual, rhetoric, metaphysics and mystical experience, John Frum welcome in the golden age of musical enlightenment with their first manifesto, A Stirring in the Noos. Nearly 6 years in the making, John Frum’s unorthodox debut maneuvers through 40 minutes of darkly psychedelic and meticulously crafted death metal, the backdrop of a bad trip. A Stirring in the Noos is a dismal distillation of oneiric transmissions, an aural reliquary of mis-shapen manifestations, and a totem to modern primitivism in heavy music.

John Frum Is:

Matt Hollenberg (John Zorn, Cleric)/guitar
Eli Litwin (Intensus/Deveykus/Knife The Glitter)/drums
Derek Rydquist (Ex-The Faceless)/vocals
Liam Wilson (The Dillinger Escape Plan, Starkweather)/bass
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Artist biography from last.fm