Gall on Scouler's Willow (Salix scouleriana)
On Quercus lyrata.
Same tree on flood plain
Gall:
Disholcaspis quercusmamma
https://www.inaturalist.org/observations/146084521
https://www.inaturalist.orCallirhytis quercusventricosag/observations/181794748
I found quite a number of deformed acorns on one coast live oak (Q. agrifolia) tree.