Klaang's scoutship was a type of one-man Klingon vessel piloted by Klaang, a courier, during the mid-22nd century.
In early 2151, Klaang visited Rigel X aboard his scoutship before it was destroyed in a crash landing on Earth during a confrontation with the Suliban in April of that year. (ENT: "Broken Bow")
The class of Klaang's vessel, K'toch-class, was not given in the final episode, but was mentioned in the script and novelization of
Broken Bow, and in a deleted scene included in the ENT Season 1 DVD.