The Ragar class was a type of incursion frigate that saw service in the Cardassian military during the 24th century. (Ship Recognition Manual, Volume 2: Starships of the Cardassian Union)
In the Verin'kano tactic used by the Cardassian space forces to assault a target, Ragar-class vessels would often comprise the second wave of attackers following a first wave of Hideki-class vessels. (The Dominion War Sourcebook: The Fires of Armageddon)