From Frostgrave Wiki

As one of the core principles of Joseph A. McCullough's games is that they remain modular and simple bases for players to build upon, the rulebooks specify that using proxies is both allowed and encouraged. However, a number of manufacturers have released officially licensed miniatures, most notably, North Stat Military Figures. These are listed below.

Additionally, there are proxy miniatures, some of which have been created specifically for use with one or more of these games, that are listed below. Notes on quality and compatibility with licensed miniatures are also included. Feel free to expand this list.