Here are a list of snacks that my kids eat:
Its good to try and think of snacks as mini-meals that provide some protein or fat with the starch to keep the little tummies full.
Keep in mind of certain foods being choking hazards for ages 1 to 4 and always watch your child during meal or snack time.
Here is an additional link to some more healthy snacks!
*Remember to watch your child at all times while they are eating and to keep in mind the foods that may cause choking in babies and toddlers.