is ‘rogue one’ the death star itself?
It’s the origin for the military callsign “Rogue” for the team on the mission (Rebels).
We don’t get to hear of Rogue Squadron until the Empire Strikes Back (although it was adopted from the small group and became a full squadron).
There was also a “Renegade” Squadron but they are sadly never mentioned.
Rogue Squadron fought the AT-AT invasion in the snow speeders and Renegade Squadron helped the transports escape.