Personally I usually don't give treats. Chins don't need them and unless you're taming a chin that doesn't like anyone I recommend leaving them to their normal diet. Otherwise unsweetened oats us ok, raisins is okay but controversial. I've fed oats, rose hips, cheerios, don't reccomend fruit but it's commonly given. Absolutely do not feed salt, toast or any kind of seeds or nuts including sunflower seeds. Cuttle bone is okay. I don't feed herbs but if you do consult with someone who actually does. Alfalfa is the safest and can be part of their regular diet in addition to timothy hay but probably isn't going to have the same effect as a piece of raisin. It is very common to feed a chin 2 raisins a day without problems. As always never feed treats to a sick or stressed chin. They have very sensitive digestive systems that if they are disrupted can have fatal results. Treat responsibly.
Thanks so much! I'm glad to hear 2 raisins a day are fine; the chinchillas in my classroom always get raisins after we clean their cage and I'm glad it's not unhealthy

I thought salt lick sounded kind of funny, but I heard chinchillas like them. That's why I checked on here, the internet can say some funky stuff! I heard of someone who fed her chins a sunflower seed once a month, but I won't feed it if it's dangerous.
Thanks again! I was so scared of feeding them something harmful just cause I read it was okay