Combine chipotle and oil in a small bowl; rub evenly over pork.
Combine oregano and the next 4 ingredients (through black pepper).
Sprinkle spice mixture evenly over pork, and let stand for 30 minutes.
Place the pork on grill rack coated with cooking spray, and grill for 6 minutes on each side or until a thermometer registers 14
Remove pork from grill; let stand 5 minutes. Coarsely chop pork; keep warm.
To prepare salsa, place pineapple on a grill rack coated with cooking spray; grill for 5 minutes on each side. Coarsely chop pineapple, and place in a medium bowl.
Add cilantro and next 4 ingredients (through jalapeo); toss to combine.
Warm the tortillas according to package directions.
Place 2 tortillas on each of 4 plates, and divide pork evenly among tortillas. Top each taco with about 3 tablespoons salsa.