Ideally a flat shot of a leaf or several leaves would help, since so many oaks can better be distinguished by subtle leaf shapes -- lobes, sinuses, etc. Also, younger oaks can have leaves shaped differently than older oaks. So there's that too.

Initially I could only guess something in the red oak group -- Northern Red Oak or perhaps Black Oak. But oaks can also hybridize within their group. You might want to see what else is growing nearby that looks like it.

I think you'd want to stake it to a vertical position.

not northern red, but could be black oak or possibly bear oak (Q ilicifolia)

I agree w/arbordave for the 2 suggestions. Certainly in the black/red oak group. I show a bear oak near me:

As far as advice, most any oak can be a desirable tree. Bear oak would be a small oak. Not really necessary to straighten IMO.

when its trunk is a foot thick.. and the tree 30 to 40 feet tall .. if you should love so long.. the trunk will be straight as you wish ... tree time is counted in decades... so it will take a while ...

i wouldnt mess with it.. its got a great back story.. dont kill it.. trying to change it.. love it for what it is ...

that said.. if you want to try to make a bow.. in ground.. [as in bow and arrow...] ....go ahead and try to bend it back... what can go wrong.... lol

ken

Thanks everyone!

One point is that either bear or black oak aren't shade tolerant and wouldn't thrive in shade.