Name these things on my white oak?

Teeder

5 year old buck +
I don't remember seeing these before.

Maybe something to do with catkins, i hope?
 

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Frank and Sally.
Sorry.. I came across this:
ROAK8.jpg
 
The flowers, right?
 
I think it's wool sower gall. I found it on my young white oaks as well.

 
Looks right. So, I should remove them, correct?
 
I left them on mine. My understanding is the wasps are harmless, and the gall(s) are mainly cosmetic with regard to the tree.
 
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