These are small printable masks of Monomon, Lurien, and Herrah from the game Hollow Knight. They were designed to clip onto straps like those on backpacks. Each mask is a two-piece print. I printed the masks in white and the clips in black. I included images of how I positioned the pieces when printing. To attach the masks to the clips, I used m2 4mm screws but a dab of glue would also work. I included a step file in case you want to modify the clip design.
The author hasn't provided the model origin yet.