From Wikipedia: Most believe that he earned the nickname "Peanut" due to a tattoo of the Planters Peanuts "Mr. Peanut" character on his hip, but it was given to him by his grandmother. He said it's P-Nut, not Peanut.
I didn't think he got tackled, I thought he slipped and the lineman fell on him. That's not a hold. Maybe I saw it wrong though. Fell on him and held him down.