Preheat the oven to 350° and line 2 baking sheets with parchment paper.
Combine the gluten free baking flour, salt, parmesan cheese, coconut oil, cayenne pepper, and hot water in the bowl of a stand mixer fitted with a paddle attachment. Once the dough comes together into a ball, turn it onto a lightly floured (dust with more of the gluten free baking flour) surface and gently knead a few times.
Roll out the dough until it is very thin, approximately ⅛th to 1/16th of an inch thick.
Using a fish cookie cutter, approximately 3 x 2 inches in size, cut out the crackers and place them on the baking sheets. Make the fish eyes with the bottom of a straw or other pointed object. Make the fish the mouths with the side edge of a spoon.
Bake 12-15 minutes, or until they start to brown around the edges.