Preheat oven to 375 degrees F. Line a baking sheet with parchment paper or a silicone baking mat; set aside.
Roll out the crescent rolls. With a small paring knife, cut along seams to create triangles. Cut each triangle down the middle, lengthwise, so you have 16 skinny strips of crescent dough.
Wrap each strip around each hot dog piece, leaving a little space at the edges. Sprinkle the tops with poppy seeds, if using.
Bake until golden brown, about 10-12 minutes.
Serve immediately with ketchup and mustard, or your preferred dipping sauce.