Baby Favorite: Frozen Peas

I got a tip from a friend last week to give Coco frozen peas, straight out of the freezer, as a snack, or appetizer, or treat. Today we tried it out and they were a super hit! :) So soothing for those teething gums and a new sensation to experience. Not to mention the fun of fine tuning that pincer grip and getting them into her mouth. 
I'm looking for other snack ideas for Coco. That way, while I'm heating her baby food, she has something to keep her occupied and happy. What are your baby's favorite snacks and treats? Which ones are not so great?