Here are some tasty kid approved Gluten free products that I recommend:
Glutino yogurt covered pretzels- This one gets 5 stars, they taste great and I love them myself. They are a little pricey though.
Enjoy Life Snickerdoodles- 5 stars as well, I think this is one of the best tasting cookies I've ever eaten.
K-Critter's Snack Packs-4 stars because I don't really enjoy the taste but they are kid approved by several visiting kids an my own toddler. Also, I like that they come in individual snack packs.
Enjoy Life Sunbutter Crunch bars-4 stars because they are a little hard to chew so I would recommend for good chewers age 2 plus but they are quite tasty.