I think that the strange piggish looking orc was meant to be Gothmog.  In the book, he was mentioned as the Lieutenant of Mordor who led the army of the Witch-King fell, but he wasn't hardly described at all.  Jackson, of course jumped at this and made his own character who lead the orcs.  I saw on IMDb that he was played by the same guy who did the Lord of the Nazgul and also Lurtz in the first movie.
		 
		
		
		
		
		
		
			
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				'They say that the One will himself enter into Arda, and heal Men and all the Marring from the beginning to the end."
			 
		
		
		
		
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