Try sending in some yogurt, hummus, dressing, sauce, or cottage cheese for kids to dip their fruit and veggies in
Vary the sizes and shapes of whatever you offer (diced cucumbers, small spears of carrot, wedges of strawberries, small sections of corn on the cob, small “trees” of broccoli, etc.)
Try no-sugar-added canned fruits, fruit cups, jello with fruit, or applesauce