Slice and carve the carrot to resemble Frankenstein's hair; boil the carrot in water and dashi broth for 5-10mins or until tender.
Mix seasoned rice vinegar in a bowl of cooked rice.
Sprinkle matcha powder over the rice; mix until the rice has a green tint.
Lay a seaweed sheet over a bamboo mat; add another partial sheet to extend it; using a damp finger (dip in water) to adhere them together; approx 5"x 10" (depending on how large you want to make the head).
Lay down the carrot as the first layer on the middle of the nori sheet.
Place the green-tinted rice over the carrot to create the forehead.
Wrap each of the 2 mozzarella sticks with a sheet of nori (creating a dark outline for the eyes); use a damp finger to seal the nori; and place them over the layer of rice.
Add another layer of rice.
Slice a cooked hot dog horizontally (the mouth); then place on top of the rice.
Add a final layer of rice.
Enclose with the seaweed and tighten the bamboo sheet; applying gentle pressure to seal the head/face together.
Using a sharp knife, cut the sushi roll into 5-6 even pieces.