For the sweet croissant caterpillar, mix the nuts with the sugar and milk until a thick mass is formed.Preheat oven to 178 °C.
Process croissant dough directly from the refrigerator and unroll on the baking paper rolled along the baking sheet.
Cut small pieces of dough from the dough, fill them in the center with the nut mixture, shape them into balls and place them together in a coiled worm.
Shape a larger piece round and place as a head at one end. Shape remaining dough into an oblong shape and place at the other end.
Brush dough with beaten egg and bake in preheated oven for about 20 minutes. When the sweet croissant caterpillar is cold, decorate with chocolate.