This article includes spoilers for Galaxy on Fire 3: Manitcore.
Terran Frigates are large frigates seen occasonaly in Galaxy on Fire 3: Manticore
At this time, there is not much information about this capital ship other than it appears to be a frigate.
In some concept art pictures these Frigates are refered to as Terran Frigates. Whether or not this is the actual name for this ship is unclear.