Smoked Turkey and Bacon Chowder with Pumpernickel and Cranberry Croutons

Ingredients

2 tablespoons vegetable oil

4 smoked turkey drumsticks (4 to 4 1/2 pounds total)

2 cups chopped applewood-smoked bacon (about 10 ounces), divided

2 pounds russet potatoes, peeled, diced

5 cups chopped onions

4 cups chopped celery

3 cups chopped carrots

12 large garlic cloves, peeled

2 tablespoons tomato paste

12 cups (or more) low-salt chicken broth

Garnish (optional)