In a medium bowl, combine diced pineapple, tomatoes, red onion, cilantro, and jalapeno. Mix well and set aside.
In another bowl, mash avocados with a fork. Stir in diced red onion, lime juice, and salt.
Warm tortillas in a dry skillet or over a flame until pliable.
Spread a spoonful of guacamole onto each tortilla, then top with pineapple salsa.
Fold tortillas in half and serve immediately.