Flip cupcakes upside-down. Scoop out a 1/2" cavity from each cupcake.
Fill cupcake hollow with green frosting and swirl around, creating a two-toned look.
Melt the chocolate chips and pour into piping bag (or zip-top bag).
Cut licorice into 4" pieces. Use melted chocolate to secure each end of a piece of licorice to opposite sides of cupcake (as a handle).
Use melted chocolate to secure pretzel fire to bottom (rounded) of each cupcake.