Did I read somewhere that you cannot have snacks on Whole 30? I'm not looking for a bag of chips or a candy bar, but I do like to have celery and almond butter as a snack.
You should try to eat enough at meals to get you through to the next meal. If you are legitimately, physiologically hungry, then eat a snack. Try not to snack just for boredom/snacking's sake. If you are finding that you are consistently hungry between meals, try adding more fat to meals.
It's fine. Ideally, you would have a small amount of protein as well. I know there is some protein in almond butter, but not enough that it meats the meal template requirements. And that's really what you're going for - meeting the meal template guidelines, just smaller portions.
I was nervous about that too, but I've found that I'm really not all that hungry between meals. So maybe you'll find that you don't really need a snack.