And the force Frodo saw ambushed in Ithilien was one of Haradrim, complete with Oliphaunts- but this was north of the Morgul road, so presumably they were bound for the Morannon.
On the other hand, in Tolkien's unpublished Chronology the army from the Morannon comprised Orcs and Easterlings, not Haradrim, and was the force which crossed at Cair Andros and held the North Road to block the Rohirrim (which Theoden bypassed via the Stonewain Valley, and Elfhelm destroyed some days later).
It's worth observing that the Morgul-host took hours to pass, Frodo wasn't watching it most of that time, and it's never mentioned exactly who was in it- save that it was led by "a great cavalry of horsemen." These last couldn't have been Orcs.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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