Heat vegetable oil in a skillet or wok over medium-high heat. Add pork stir-fry strips and sauté until browned; remove from skillet.
Add stir-fry vegetables and teriyaki sauce to skillet; stir-fry until crisp-tender.
Return pork to skillet with stir-fried vegetables; add 1 teaspoon sesame oil and toss to coat.
In a small bowl, combine mayonnaise and sriracha sauce.
Spread sriracha mayo onto toasted hoagie rolls. Top with stir-fried pork and veggies and garnish with cashews and scallions.