I'm not sure anybody among the Ese/Aesir would actually qualify. Even Balder is traditionally depicted as rather stocky (which makes sense, given that genetically, Northmen are larger and stockier than those from around the Mediterranean). While the Celts, Teutons, and Norse weren't as misogynistic as the Greeks or Romans, the surviving accounts indicate that they still saw effeminate qualities in males as a negative; "ergi", which means "unmanly", was the single worst insult you could throw at a man, such that the insulted was legally free
and socially obligated to kill the insulter.
Then again, paradoxically, you might get away with a young Woden being this, seeing as he has several effeminate qualities in his behavior, and his traditional depictions actually show him to be pretty petite, at least as The Wanderer.
I think the best bet for finding "cute boy" deities really is around areas of more "developed" civilization, such as India or the Mediterranean. The above-mentioned Krishna and Skanda are perfect examples from India. I tend to think of Apollo as fairly effeminate, as well, though a follower of Hellenismos or Religio Romana would probably be a better authority on that.
I've also been in a slow process of re-deifying Robin Hood. Would that count?