Wiggle while you combine the avocado, brown sugar, coconut milk, mango, chicken, lime juice and soy sauce in a mixing bowl. Let sit for 5 minutes. (You can stop wiggling now!)
This step is like magic. Fill another bowl with warm water and place the rice paper in the bowl. Wave your hands over the bowl like a magician and shout, "Abracadabra!" Let it sit until the rice paper is soft and almost invisible. Remove the rice paper from the water. Let it sit on a clean plate for 1 minute. Don't worry-it should be kind of sticky.
Place the avocado mixture on the lower center of the rice paper. Fold the outside in so it touches and roll the bottom of the paper up to form a log shape. Carefully slice the log into 5 equal pieces. This is the caterpillar's body. Place pretzel sticks around the body for legs.
To make the caterpillar's head, carefully slice off one-third of the tomato. This piece will be the bottom part of his head.
Balance the other side of the tomato on top to make a goofy grin. Use a toothpick to poke eyeholes in the tomato head and press in the currants for eyes. Poke 2 more holes on top of the head and push in the carrot sticks for antennae.
Enjoy your hungry caterpillar before he turns into a butterfly!