Can snicker doodles be using coconut oil instead of butter

It sounds insignificant, but go with 18% liquid, and one of the "milks" will likely yield a bit better results.

Technically, yes. I think they'll taste better w/ butter. Since coconut oil is 100% fat and butter is aprox 80% fat, you'll want to use 80% coc oil and 20% liquid (water, coconut milk, or almond milk) in place of the butter. I deal w/ this a lot when baking for myself-severely lactose intolerant!