1. Yes, and Hossdaniels is right about nocturnal deer.
2&3. Corn tolerates low pH (6.0 is preferred), but takes a fair amount of work to grow successfully. Peas/Oats mix (or oats alone) tolerate lower pH, plant in late summer (mid-August), but will die out at about 15-25 degrees. Winter rye or winter wheat will tolerate low pH, plant in mid-August to early September, and will survive the winter providing food until spring. In general, grasses do best in poor soil. If the ground is flooded, not much will work. Buy seed from a local ag supply business, they have varieties that will work in your area.