Wash the grapes and strawberries. Slice off the tops of the strawberries to make a flat surface. Peel and slice the banana into even rounds.
Start by placing a green grape on the skewer, followed by a banana slice, then a strawberry (pointed side up), and finish with a mini marshmallow on top. Adjust gently so the fruit stays in place.
If you’re making them ahead, brush the banana slices lightly with lemon juice to keep them looking fresh.
Arrange the Grinch fruit sticks on a platter and serve fresh.