Freeform Chicken Meatballs With Carrots and Yogurt Sauce

Name: Freeform Chicken Meatballs With Carrots and Yogurt Sauce
Ingredients: 1½ lb. small carrots, scrubbed, tops trimmed to about ½, halved lengthwise; ½ tsp. crushed red pepper flakes; 5 Tbsp. extra-virgin olive oil, divided, plus more for drizzling; 2¼ tsp. kosher salt, divided; 1 lb. ground chicken or ground turkey; 6 scallions, white and pale-green parts finely chopped; 1 large egg, beaten to blend; 2 Tbsp. plain breadcrumbs; 3 tsp. finely grated lemon zest; 2 tsp. garam masala; 1 cup plain Greek-style yogurt, preferably full-fat; 2 Tbsp. fresh lemon juice, plus more for serving; 2 cups baby arugula or watercress; Flaky sea salt