Color canned frosting green with food coloring and spread onto unwrapped rice krispies squares. Attach edible eyes as shown.
Break a pretzel stick into 4 portions. Dip into frosting and insert into lower sides of rice krispies squares as shown.
Melt chocolate and pour into piping bag/ziplock bag and snip the corner. Pipe into grins/lips/mouth
Sprinkle oreo crust as hairs on upper area above eyes and your Frankenstein is ready to serve :)