Combine 1 cup each chopped strawberries and mini marshmallows, 1/3 cup coconut and 1/2 cup each plain Greek yogurt and whipped cream in a large bowl with a rubber spatula.
Using kitchen shears, cut 2 pieces green licorice on the diagonal into small pieces. Fold into the strawberry mixture; cover and refrigerate.
Preheat the broiler. Using a serrated knife, shave the edge off both long sides of the pound cake. Make 2 lengthwise cuts, about an inch deep, in the top of the cake, 1 inch in from each edge.
Carefully pry out the middle strip. Place the rest of the cake on a baking sheet and broil, turning, until toasted on all sides. Fill the opening in the cake with the strawberry mixture, mounding it on top; serve with gummy lemon slices.