Oh I see what your saying..
Like when we get peanut butter stuck to the roof of our mouths we like.. make funny faces.
I never heard about the RI having a peanut buttery look.. explanation anyone?
He'll probably be fine, Unless he swallows a large amount and it screws up his system, he shouldn't have a problem. It would be a good idea to attempt to get it out by opening his mouth lightly with a tooth pick and seeing what you can get. :]