The Crinfrid Reavers are a group of mercenaries hired by king Niedamir to take part in the hunt for a dragon outside Barefield in "The Bounds of Reason", a short story in the Sword of Destiny collection by Andrzej Sapkowski. The group includes:
The Crinfrid Reavers make an appearance in the prologue of The Witcher 2. At that point in time, they are without Boholt and have a new recruit, Newboy.
In the Blood and Wine expansion
Images from the graphic novel, "Granica możliwości":
Gwent card art