From A Wiki of Ice and Fire
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|Allegiance|| House Buckwell|
|Died||In 300 AC (supposedly)|
|Book(s)|| A Clash of Kings (appears)|
A Storm of Swords (mentioned)
A Dance with Dragons (mentioned)
He is a square, stolid man.
A Clash of Kings
Jarman is the leader of the scouts on the ranging beyond the Wall. Qhorin Halfhand suggests himself, Jarman and Thoren Smallwood as leaders of small scouting groups sent into the mountains to seek out the wildling camp.
A Storm of Swords
Jarman lead the scouting mission to climb the Giant's Stair in search of the wildlings. By the time they return, the disastrous Battle of the Fist of the First Men has already happened and the main party already evacuated. His team remains in the wilderness tracking Mance's host where they spot Jon Snow walking freely amongst the wildlings. Jarman's team is able to return to Castle Black after the main party and before Jon Snow. He reports to Maester Aemon and Donal Noye that Jon may be a turncloak.
A Dance with Dragons
Jon thinks to himself that the Night's Watch has lost too many of its best men, including Jeor Mormont, Qhorin, Donal, Benjen Stark, and Jarmen, indicating the scout is now deceased. He was possibly killed in the Battle of the Bridge of Skulls.