Norm-3PO is the Star Wars droid version of Norm. His name is a parody of C-3PO.
Norm-3P0 first appeared when he and Darthenshmirtz arrive at the Death Star, where Darthenshmirtz exclaimed that he has built in a new -inator called the Sith-inator for the Galactic Empire. Darthenshmirtz then assigns Norm-3P0 to find any trash that has been personally touched by Darth Vader, so that he can extract enough Force into his Sith-inator. After delivering enough Force, Darthenshmirtz attempts to test the device onto his captured nemesis, Perry the Rebelpus of the Rebellion. However, Ferb gets hit by accident, and is thus turned into a Sith. Darthenshmirtz and Norm-3P0 head to get more trash to power up the Sith-inator, but by the time they come back, Perry has been released from his carbonite trap and disables Norm-3P0 before fighting with Darthenshmirtz, who later escaped. It is unknown what happened to Norm-3P0 afterwards in the end, either he was perished during the Death Star explosion along with the other Galactic Empire employees onboard, or he could've escaped, since much of the attendants have escaped in the Firestar Girls' ship before the Death Star exploded, including several Imperial officers.
Norm-3PO looks similar to C-3PO, except that he is silver — a reference to TC-14 — instead of gold.