Autism and Oral stimulation?

My son happens to be on the spectrum. He is four years old, and has been having a need for oral stimulation. Does anyone have ideas? At first he was sucking on his sleeves and only sticking his tounge out when he was excited. Now He is yelling out randomly, spiting, tongue out when excited, making noses with his mouth, licking everything. We have tried pop rocks, distracters, chewy candies, and gum. We recently took him somewhere in Denver with lots of snow(he is not used to snow) He was sooo excited, he took off his gloves to eat the snow licked it all the oral things times 10. Now we are back and left with that. Any ideas how to help him? I know we will never get rid of oral stimulation but I would love to minimize it.Any kind of ideas would be great and well appreciated. Thank you so much