There's a word for that
Acorns and nuts are known as "Mast" and a year with lots of nuts is called a "Mast Year". Our pin oak, which rarely produces a mast, had acorns this year. We were down in the Blue Ridge in the autumn, and the ground was just covered in acorns and hickory nuts.
Only problem is that mast years result in bigger rodent populations.
Learn more here:
http://en.wikipedia.org/wiki/Mast_(botany)