Nope. While they sway like any bobblehead, they are also rotating on an axis (at least some of them are - haven't looked closely enough at all of them yet). In Earth's case, it's the opposite rotation direction to what it should be. I wouldn't have a clue whether the other planets are rotating as they should or not.I'd hazard a guess that these will rotate as you steer the ship.
This minor bug aside, the planet bobbleheads look oh so cool. Thx heaps Frontier!