I've received both of my gjallarhorns from normal crota, [spoiler]OH YEAH![/spoiler]i think it drops just as much as any other exotic.
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i got my first one from Ir Yut, second from crota third from nightfall. :P
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Crota?this is the first I have heard of anyone getting it on Crota,people usually get Hunger of Crota..............................interesting.