The white oak family has less tannin than the black oak family. THe white oak family acorns I have tried are White Oak, Burr Oak, and Club Oak. There are many varieties. White oaks have rounded leaves. Black oaks have pointed leaves.
Squirrels go for white oak acorns first.
They're not dumb. They don't like the tannin either. Black oak acorns will make you pucker up just like eating unripe persimmons.