Place the chicken thighs in the bottom of the crockpot.
In a separate bowl, mix together the pineapple chunks with juice, barbecue sauce, soy sauce, minced garlic, ground ginger, black pepper, and salt.
Pour the pineapple mixture over the chicken in the crockpot, ensuring the chicken is well coated.
Cover and cook on low for 6-8 hours or on high for 3-4 hours, until the chicken is tender and fully cooked.
Once cooked, shred the chicken with two forks and stir it back into the sauce.
Serve hot, garnished with chopped green onions.