Well, I couldn't figure out exactly what type of Oak this is, so I've decided to call it a G-Oak. And it's fruit is the G-Oak-ash.
"On the 25th of December
Geocaching gave to us
A G-Oak-ash
In an Oak tree"
Note this is not the OG-Oak - you will see that a short distance away, but that one is not fruiting, so there is no need to go looking for any G-Oak-ashes there.
You may need to increase your elevation slightly to reach the G-Oak-ash fruit of this tree, and while it's not difficult, obviously take care not to hurt yourself or the tree.
BYOP. Merry Christmas. Happy caching!