When you hear the phrase “body-swap comedy,” you tend to think of complications. A good entry in the genre, like “13 Going on 30” or “All of Me,” can involve so much personality juggling that it becomes a heady experience. That was true, in its way, of “Hoppers,” the recent Pixar film in which a skate-punk college kid found herself in the body of a beaver who was actually a robot avatar. “ Swapped ,” a Netflix critter comedy that involves a fair amount of body switching, never approaches that level of complication. This one, by design, feels tailored to an extremely young audience. But that isn’t a backhanded insult. On the story level, “Swapped” is simple to a fault, yet there’s a surprise enchantment to it — it’s a woodland fairy tale for seven-year-olds, but on that score it’s visually ravishing and actually rather touching. It was directed by Nathan Greno, whose one other major credit is that he was the co-director of “Tangled” (a very engaging film).…