One of the Vanguard novels featured a Loknar
class frigate from FASA (but IIRC used a different spelling, namely Locknar
, which I believe Dayton Ward
mentioned was something from the movie Heavy Metal
Cast No Shadow
had a Riskadh
class cruiser and some D-18 class ships, both Klingon vessels from FASA.
I know these are both ship examples, so I'm not sure if that's what you're looking for, but it's all I can think of at the moment.
EDIT: one of the Titan novels had a Kasheeta crewmember, which I believe was a FASA-invented name for one of the background aliens in the council scene in TVH.