Boil the potato in salted water until tender, then peel and dice into small 1/4-inch cubes.
In a large skillet over medium heat, add the avocado oil and toast the cumin seeds for 30 seconds until fragrant.
Add the ground turkey to the skillet, breaking it into small crumbles with a spatula until fully browned and cooked through.
Stir in the diced potatoes, frozen peas, turmeric, garam masala, sea salt, and black pepper; cook for 3-4 minutes to allow flavors to meld.
Cut the whole wheat tortilla into four equal wedges.
Place a portion of the turkey and potato mixture in the center of each wedge, fold the edges to form a triangle, and seal the seams using a small amount of water.
Place the samosas in an air fryer basket and cook at 375°F for 8-10 minutes, flipping halfway through, until the exterior is golden brown and crisp.
While the samosas cook, whisk together the Greek yogurt, finely chopped cilantro, and lemon juice in a small bowl to create the zesty chutney.
Serve the hot samosas immediately with the chilled yogurt chutney on the side.