I have never heard over it
it might be made up, But I'm certain Mongols called some of their elite warriors "Mergen".
He's rather unique units of Karamanids.
Fityan Braves, these are urban folk, members of Ahi guild.
Bolghar Slingers, Bulgar/Bolgar, its not clear what relationship they havewith Bulgarians, but these guys inhabited a mountainious area in Karaman region and reported to fight with slings.
Kul Lancers/Kul Foot Archers, elite late units, I made them up, they're like Ghulams and Mamluks.
Garibs, poor mercenaries.
Tatar Horse Archers, Tatars from Central Anatolia and parts of eastern Anatolia oftenly allied with Karamanids and fought for theö
Kurdish Tribal lances, mercenaries avaiable at east.
Karavul Cavalry, Scouts, raiders, frontier guards and bandit hunters.