Roll 1 sheet thawed frozen puff pastry into a 12-inch square on a floured surface; cut into three 4-inch-wide strips. Spread with cookie butter (speculoos). Brush the edges with beaten egg and fold in half lengthwise; press to seal. Cut each crosswise into 4 pieces. Place on a parchment-lined baking sheet; cut three slits along the sealed edge of each. Brush with beaten egg, then press slivered almonds into the pastry for "claws"; sprinkle with turbinado sugar. Freeze 10 minutes. Bake at 400 degrees F until golden, about 25 minutes.