To begin, melt white chocolate in a small bowl at 30-second increments stirring after every 30 seconds.
When melted, place a marshmallow on a lollipop stick.
Dip into the chocolate until the marshmallow is fully covered.
Place in an area such as in a lollipop stand to let dry.
Then take your frosting bag and put black chocolate in your bag, melt at 30-second increments. This way will take a shorter melt time than the bowl. However, be careful; the bag method can get hot if over-melted.
Next, snip the end of the bag or use frosting tips to pipe hair and facial features on pop and add eyes.
Follow this same method for each character, swapping out caramel colors for uncle Fester and Puggsly, yellow and black for cousin it. Also, for Uncle fester, you will need to add eyes too.