Preheat the oven to 180°C. Remove the puff pastry from the freezer and defrost according to the directions on the package. Wash the pumpkin, peel it, measure 100 g of pumpkin pulp, cut into small cubes.
In a bowl, combine pumpkin and sugar.
Roll out the puff pastry with a rolling pin, cut into 3 equal rectangles, then cut the rectangles diagonally.
Place the filling on the wide edge of the dough triangle and wrap the croissant. Do this for the entire dough.
Line a baking sheet with parchment. Grease the parchment with butter. Place the croissants and place the baking sheet in the oven for 20 minutes at 180°C.