Here are some healthy snack options for kids:
1)Fresh fruits
2)Carrot sticks with a little peanut butter/almond butter/hummus.
3)Fruit chaat
4)Channa/corn chaat
5)Popcorn/\"Light\" microwave popcorn (made with very little oil)
6)Idli/dhokla
7)Fruit smoothies (http://www.desidieter.com/popular-recipes/soups-beverages/banana-berry-fruit-smoothie.html)
8)Cut fruits in Greek yogurt/thick curd.
9)Vegetable upma, dosa, bread upma, khandvi.
10)A handful of mixed dried fruits and nuts.
Basically avoid fried foods(like chips, samosas,chivdas/farsans/namkeens), snacks which have too much sugar(like cakes, candies, cookies) and junk food like pizzas/burgers.
Here is a link to a sample diet for kids:
http://www.desidieter.com/kids-diet.html
Staying Healthy Was Never so Easy!
Wishing you Good Health and a Good Life!