Well, there may have been orcs along side the Troll Guard but I doubt that his kills consisted mostly of orcs because it says that he was surrounded by the Guard(or maybe it doesn't, you may get me there).
Also, in The Lost Road it states that Hurin slew 100 orcs after everyone else had been killed or fled. From this I would assume that Tolkien changed it to killing 70 and a Troll Guard to signify how great a warrior Hurin really was. Because when you think of it, Boromir killed many many orcs at the Rauros and Boromir was definately no Hurin.
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