The snakehead was a type of warp-capable scout ship employed by Romulans in the late 24th century. Despite its small size, it was heavily armed with twin retractable ventral-mounted disruptor cannons and featured double subthrusters. It was protected by deflector shields and a cloaking device, which could be reversed to project a false decoy image of the ship. It was operated by a single pilot.
In 2399, Narek took one of these vessels from the Artifact and followed La Sirena through a transwarp conduit to Coppelius and attacked it, only for his ship to be disabled by an orchid sent from the surface. (PIC: "Nepenthe", "Broken Pieces", "Et in Arcadia Ego, Part 1")