Technically, torque is the cross product F x r, which yields a vector. Cross products are not commutative. That's just technicalities, though.
When I hear pound-feet, I think of a motor's torque. When I hear foot-pounds, I think of torquing bolts. I suppose that if we consider the definition F x r, the correct unit is pounds x foot, and they just don't say "cross" out loud?