Yes. If mockernut, the leaf rachis (stem) will be tomentose (hairy or fuzzy). Mockernut has leaflets in 7's. Pignut and shagbark have leaflets in 5's.
All the oak leaves are southern red oak, Quercus falcata. Notice the round, bell shaped leaf base.
Yes on red maple. Red maple is serrated between the leaf lobes, sugar maples leaves are smooth between the lobes.
Yes, hawthorne. There are only hundreds of species and varieties. A difficult species group.