In this Pikachu cookie cutter, you can customize dimensions, wall thickness, etc.
I used Inkscape to modify an SVG file I found online (the person who made that SVG said I could use it, but told me not to give them any credit) so that it could be used with my OpenSCAD Cookie Cutter Inkscape extension to generate an OpenSCAD file.
To resize without changing wall thickness, use the size parameter (which gives the size in millimeters of the larger dimension of the cookie cutter) in the OpenSCAD file rather than just resizing the STL.
I also made an Instructable on how to make cookie cutters like this one with Inkscape.
Update: I added a new version with the pupils, nose and mouth filled in.
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