Pour your green candy melts into a microwave-safe bowl and heat them in short 30-second bursts, stirring in between each round. Keep going until the mixture is fully smooth and glossy with no lumps left. Avoid rushing this step, since scorched candy melts turn grainy and won't coat the marshmallows evenly.
Push one lollipop stick into the flat end of each marshmallow, going about halfway through so it holds steady. This gives you a handle for the next steps and makes the final treat easy to hold. Set them aside on your prepared baking sheet once they're ready.
Holding each marshmallow by its stick, dip it into the melted green candy, turning it until it's fully coated on all sides. Let any extra drip off before pulling it out completely. Move quickly here since the coating starts setting the moment it touches the cool marshmallow.
While the coating is still wet, press two candy eyeballs onto the front of each marshmallow. Sprinkle on the black or brown jimmies right at the top to look like messy hair. Work fast, because once the candy melts firm up, nothing else will stick.
Push a small broken piece of pretzel stick into each side of the marshmallow to form Frankenstein's neck bolts. Once everything has set for a few minutes, use your edible marker to draw a simple stitched mouth. Stand the finished pops upright in your glass of rice until fully hardened.