Cut each apple in half and core the centers. Cut the top and bottom of each apple off at a slight inward angle so the apple halves stand upright. Cut away wedge-shaped slices from the centers using a paring knife to create a "mouth." Slice the wedges deep enough so a small hole is created in the center of each “V.” Brush the exposed apple flesh with lemon juice to prevent browning.
Stick the sunflower seeds into the apple's flesh to create "teeth."
Insert a mango slice into the hole in the center of each apple to create a tongue. Add small dots of frosting to the backs of the candy eyeballs to secure them just above the mouth.