Orc tribes of Angmar
The orcs of Angmar are tribal, and there are four known tribes, these are: (note that eastern Angmar refers to all parts of Angmar only reachable through crossing the Rammas Deluon, not geographically. Also, all tribes are found within Carn Dûm.)
The Blogmal Tribe is a smaller orc tribe, and it seems to be scattered across north-eastern Eriador. They can be found in: The Rift of Nûrz Ghâshu, Eastern Ram Dúath, Norbury Gates, Fornost, Goblin-town and Gorothlad.
It is hard to determine this orc tribe's strength, as it is found all over Eriador: The Rift, Ram Dúath, eastern Lone-lands and northern Bree-land. The Tarkrîp capital seems to be Nan Wathren. They fight with the Blogmal over mining rights in The Rift.