To make the white, coconut layer, place the Tequila, Cointreau, lime juice, coconut milk, cream of coconut, and ice into a blender. Blend on low speed until combined and smooth.
Pour the mixture into an 8-oz glass and place it into the freezer while you make the next layer.
To make the blue raspberry layer, place the Tequila, Grand Marnier, blue raspberry syrup, and ice into a blender. Blend on low speed until combined and smooth.
Pour the blue layer on top of the white layer, then use a long spoon (or straw) to lightly stir the two layers together to create a swirling pattern.
Place the glass back in the freezer while you make the final layer.
To make the red "blood" layer, use a (very clean and odor-free) garlic press/mincer to crush up the maraschino cherries. You could also cut them up finely with a knife if you prefer.
Spoon the cherries on top of the cocktail.
Garnish the Frozen Shark Attack Margarita with a cherry and gummy shark candy skewered onto a cocktail stick. Enjoy!