Why is sucking on fruit snacks a problem??? Do you just want his mouth clear of things?
You probably know that our bodies have lots of different pressure points that can be used to stimulate differing things. The mouth is included and stimulated creates a calmness for people. This is one big reason children suck their thumbs, pacifiers, bottles, mama, or any other thing they can...even adults like to use this thus the pens and pencils, the hard candies, the gum, etc...we tend to see when adults are "thinking" or "consentating" or "daydreaming"...we do it, too! This could be attributed to oxytocin which is produced by both genders.
I don't know if I'd go back to a pacifier or if I'd just leave it as it is and suggest lightening up on letting him suck on the fruit snacks...it may be better to move back to the pacifier because when he's older you can remove it from the house easier than you can his blanket, thumb, or some other object he may use as a substitute.
You may want to increase your cuddle time or something similar to take the place of oral stimulation for dopamine or oxytocin production.
We're all so different, our children are each so individual to themselves. Unless you sense a real, true danger and/or complication to life with this, I'd relax and take your child's lead for what his needs are. It probably wouldn't hurt to read the book suggested earlier by another Mom, not to jump to conclusions but to give you more ideas and questions to discuss with a doctor if you ever feel inspired to do so. Just remember, whether or not the majority of child do or do not do something your child is or is not doing, it's ok so long as he's happy, healthy, and safe.