You may also be looking for the Klingon cargo vessel.

A Klingon freighter was a type of freighter used by the Klingons during the 24th century.

In 2369, a Klingon freighter was docked at Deep Space 9 before departing for the Gamma Quadrant. (DS9: "The Storyteller")

In 2370, a Klingon freighter, located two light years from the Demilitarized Zone, responded to a general transmission from Deep Space 9. It had identified the warp signature of a Galador freighter – operated by Maquis – that was responsible for the kidnapping of Gul Dukat. (DS9: "The Maquis, Part I")

In 2371, a Klingon freighter docked at DS9 for repairs after its main computer was damaged and needed a complete two-day overhaul before they could return to the Klingon Empire. It was, however, later discovered the ship and her three crewmembers were actually part of a covert strike force that reported directly to the Klingon High Council. (DS9: "Visionary")