When listening to the com-net device of the Ornithopter used by the Harkonnen Agents to transport him and Lady Jessica, Paul Atreides caught bits of communication in the Atreides Battle Language.One of these bits was an Atreides House Trooper named Fedor reporting no survivors at Carthag and the plundering of the Guild Bank.
Dune CCG:
Fedor is featured as a character Card in the Dune Collectible Card Game ,where he is stated to be a House Atreides Lieutenant and Field Commander.