In a large bowl, whisk together the milk, pudding mix, and green food color. When the pudding thickens slightly, spoon the mixture carefully into frozen pop molds and insert the sticks. Freeze for at least 6 hours.
While the pops are freezing, prepare the royal icing ( find the recipe with video presentation here: https://kudoskitchenbyrenee.com/american-flag-heart-decorated-sugar-cookies/ )
Keep covered until ready to use.
Divide and color the icing with the black, red, green gel food color, making sure to leave some white for the eyes. You'll need more black royal icing than the other colors.
Spoon the colored icing into separate piping bags or zip-top bags making one with a larger hole for piping Frank's hair and eyebrows, and the other colors with small holes piping holes for the detail work.
When ready to decorate the pops, run each mold under hot water until the frozen pop releases from the mold. Place all the frozen pops onto a parchment lined baking sheet and refreeze again for 10 minutes to harden.
Use the royal icing in the piping bags to quickly pipe Frank's hair, eyebrows, and eyes. Use the green icing to pipe onto the gumdrops and affix them for Frank's nose, and his neck bolts. Refreeze the pops again until ready to serve.
Eat before melting, and enjoy!! :)