Isengarders :

A general term for the inhabitants and soldiers of Isengard but used especially by Tolkien with reference to the servants of Saruman in the War of the Ring.

Northerners
:

The name used in southern lands for Orcs from farther north.In particular,it was used to describe a band of more than a hundred lesser Orcs from Moria that took part in the Breaking of the Fellowship and the capture of Merry and Pippin and who were later slaughtered by the Rohirrim.
All information is thanks to the Encyclopedia of Arda and the Annals of Arda.
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