I saw something like this on Pinterest (where I get most of my ideas) and decided to make my own. The one with the bite taken out of the leg is my favorite. I used a mini cookie cutter to cut out the shapes. Then I took the edge of a cookie cutter to make it look like someone started eating one.
The buttons, eyes and cheeks were made from clay, and I painted the mouth and the white lines with acrylic paint. These were really simple and easy to make.