1. Line a cookie sheet with wax paper. Arrange doughnuts on prepared cookie sheet. Cut 3 triangles, about 1/4 by 3/4 inch, from each orange slice.
2. Spoon frosting into a ziplock bag. Press out excess air and seal bag. Snip a small (1/8-inch) corner from bag. Pipe a dot of frosting into center of each doughnut and insert a piece of orange candy, wide end into frosting, as the nose. Pipe 2 dots of frosting on each doughnut above nose, brushing away powdered sugar as necessary, and attach brown M&M's as eyes. Pipe 5 to 6 dots of decorating icing below each nose as the mouth, brushing away powdered sugar as necessary.