I have given my rats each a little piece of a pistachio nut, but never a whole one. I don't think the shell would be an issue, but the nut itself is quite large, and as Lisa said, it's not really good for them to eat nuts very much. I also rinsed all the salt off before I gave it to them, because mine were salted.
I don't think the nut would be dangerous, but probably not all that good for them to eat.
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Six new rats