Place Twinkies in freezer for at least 30 minutes or until very firm.
Prepare a baking sheet or cutting board by covering with parchment or wax paper.
Melt green candy chips by microwaving 30 seconds then stirring and repeating until melted.
Dip each Twinkie in the green chocolate and roll to completely coat.
Transfer to prepared paper.
Spear a mini marshmallow with a toothpick and dip in green chocolate to cover completely.
Position marshmallow in middle of Twinkie to act as nose. Use another toothpick to loosen marshmallow from first toothpick and to smooth out chocolate.
Using chocolate as "glue", set 2 eyes just above the nose.
Place in refrigerator for 10 minutes to set.
Lift each Twinkie to separate from paper.
Using a knife, carefully trim excess chocolate around the edges.
Melt black candy chips by microwaving 30 seconds then stirring and repeating until melted.
Dip top of each Twinkie in black chocolate to make hair.
Return to prepared paper.
Using the toothpick method, dip 12 mini marshmallows in black chocolate to coat completely and place on prepared paper to use as neck bolts.
Place in refrigerator for 5 minutes to set.
Trim any excess chocolate around the edges of each marshmallow.
Using chocolate as glue attach neck bolts to sides of Twinkies.
Take the one red chip and heat for 30-60 seconds until melted.
Using a toothpick, draw a mouth on each Frankenstein as well as the forehead scar.
Place in refrigerator for 10 minutes to set.