Preheat the oven to 400°F. Line a baking sheet with parchment paper.
Lightly flour your work surface then unfold both sheets of puff pastry and lightly roll over them with a rolling pin to seal any perforations.
Using a sharp knife, trace the shape of a football. Place the cut-out football atop the second sheet of pastry to trace and cut out a second football. (Scraps can be baked separately for dipping into additional Nutella.)
Place one of the cut-out pastry footballs on the baking sheet then spread the Nutella in an even layer, leaving a 1/2-inch border around the edges. Add the second pastry football on top.
Brush the top of the football with the eggwash.
Using a sharp knife or kitchen shears, make slits 1 inch apart along the sides of the football without cutting all the way across and leaving a 3-inch-wide strip down the center of the football. Twist each strip tightly.
Bake the puff pastry football until it is dark golden, 12 to 15 minutes. (All ovens vary, so if needed, add additional time until the football reaches your desired doneness.)
Remove the puff pastry football from the oven and let it cool completely.
Transfer the frosting to a sealable plastic bag or piping bag. Snip off the tip and pipe the laces atop the football then serve.