Technically No. Because Stormtroopers are a military branch of the legitimate form of government, they would not be considered terrorists. You could argue that the clone troopers are terrorists in Revenge of the Sith, but even so. The Rebel Alliance, on the other hand, would definitionally be considered terrorists, as they are trying to overthrow the legitimate form of government, the empire. Only when they established the New Republic on Chandrella would they be considered legitimate, and lose their 'terrorist' status.
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