Spray a wooden spoon or rubber spatula with nonstick cooking spray and line a baking sheet with parchment paper. Set aside.
Melt the butter in a large pot over medium heat. Add the marshmallows (reserving 4 pieces for garnish) and stir until completely melted, about 5 minutes; stir in the vanilla. Add the rice cereal and stir with the sprayed utensil until the cereal is completely coated and the mixture is thoroughly combined.
Coat your hands with a little nonstick cooking spray so the mixture does not stick. Divide the crispy treat mixture into two portions, 1/4 of the mixture (about 9 ounces) and 3/4 of the mixture (about 1 1/2 pounds). Using the larger portion, make a teardrop-shaped body 8 inches across at the wide end and about 12 inches long. Using your hands or a spoon, create a cavity at the tail end of the teardrop shape, where you would ordinarily put stuffing in a real turkey. Do not hollow out the entire body, you only need to make an indentation about 4 inches deep.
Take the remaining crispy treat mixture and set one-third of it aside to make the wings. From the other two thirds, mold two drumstick shapes and affix them to either side of the cavity. Make two wings and attach them to either side of the wide end of the teardrop.
Transfer the turkey to a serving platter and fill the cavity with chopped-up chocolate-wafer candy bars. For a little flourish, mix in some sliced-up green gummy candy to resemble parsley. Whisk the cinnamon and sugar together in a small bowl. Sprinkle the cinnamon-sugar over the turkey to give the outside a browned look. Attach the four reserved mini marshmallows to the ends of the drumsticks to resemble bone tips. Tuck the slices of dried pineapple, dried kiwi and some grapefruit gummy candy around the turkey for garnish.
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