Crisp and Crunchy Chicken Salad

Name: Crisp and Crunchy Chicken Salad
Ingredients: 4 skin-on, bone-in chicken thighs (about 1½ pounds total); Kosher salt; 2 teaspoons mustard seeds; 1 teaspoon fennel seeds; 1 bunch scallions; 3 small cucumbers (such as Persian or kirby); 1 bunch small radishes (such as red, Easter Egg, or icicle), trimmed; 1 kohlrabi or ½ fennel bulb, 4-inch piece daikon, 1 watermelon radish, or 1 medium beet, trimmed; 3 tablespoons (or more) red wine vinegar; Handful of salted pita chips, lightly crushed (for serving)