Preheat the oven to 400°F. Line two baking sheets with parchment paper.
In a mixing bowl, toss the potato cubes with olive oil, garlic powder, salt, and black pepper until evenly coated. Spread them in a single layer on one baking sheet.
Roast the potatoes for 25 to 30 minutes, stirring once halfway through, until golden and crisp at the edges.
While the potatoes roast, skewer each hot dog lengthwise through the center. Unroll the crescent dough and cut it into thin strips.
Wrap the dough strips around each hot dog in a crisscross pattern, leaving small gaps near the top for the mummy eyes. Place the wrapped hot dogs on the second baking sheet.
Bake the hot dog skewers for 12 to 15 minutes until the dough is golden brown.
Remove from the oven and use a small dab of yellow mustard in the gaps to create eyes on each mummy.