Mix together frosting and cake crumbs until uniform.
Roll into balls of roughly equal size and place on wax paper. (They don't need to be perfect here.)
Place cake balls in freezer for about 40 minutes to set.
Assembly
Melt chocolate over double boiler or carefully in microwave.
Take lollipop sticks and dip them into chocolate. Then, stick them ¾ of the way into cake balls.
Once finished, place cake pops in the freezer for another five minutes to solidify chocolate.
Dip cake pops on stick back into melted chocolate. Place them on wax paper upside down to set. (This will create a flat top on each cauldron.) Let pops set.
Decoration
Paint flames onto bottom of cauldron with red and orange frosting all the way around stick.
Use black icing to add handles to each cake pop.
Use green frosting to "glue" green Nerds on top of each cauldron.