Make cereal treats. Melt butter and marshmallows, stirring until smooth. Tint using orange icing color, and then stir in cereal. Press into pan; let cool. Place on a foil-wrapped cake board cut to pan shape.
Fill eyes, nose and mouth with candy-coated chocolates.
Prepare buttercream icing and tint orange. Pipe lines using tip 5 and orange icing.