From Outscape Wiki
Medium size class of battleship suitable for both independent and fleet deployment. Good levels of armour and compatibility with small and medium-sized weapons make it a well-balanced option. In-Game Description
Although not possessing the raw firepower of a destroyer, frigates are a flexible hull type unlockable fairly early on, and it is likely that most players will find a use for them, from convoy escort to planetary raider. Their data are summarised on the Frigate page.