First wolves were a species of wolf that were native to the planet of Trandosha, which is located in the Mid Rim. The Trandoshan species, whose culture heavily revolved around hunting, particularly with the assistance of Trandoshan hunting hounds, would hunt these wolves.
In 232 BBY, while searching a derelict Hutt Clan ship for a Nihil sniper, the Trandoshan Jedi Master Sskeer commented that he would have to proceed as his ancestors did when hunting frist wolves. After finding the Nihil's blaster lying on the floor of the ship, Sskeer likened the sniper to a frist wolf that had dropped its blaster.
The initial mention of frist wolves occurred in Star Wars: The High Republic comic series' second issue (2021), which was part of Phase I of the Star Wars: The High Republic multimedia project. Cavan Scott wrote the issue, Marvel Comics published it, and it was released on February 3, 2021.