I believe that Viking related smilies already exist from powers such as Fantasy, Quest, Quest2 and so on. There's probably more, but not a dedicated power at least. I mean I did find something Viking related, this is a Sticker power called Magnus that seems to be loosely based off Vikings.
https://util.xat.com/wiki/index.php?title=Magnus
Personally, I would argue that sticker doesn't do Vikings enough justice though.
As for pawns (hat#b) comes with beer, but not as you visually created. I'm sure Vikings hats previously existed, but that may have been a limited hat when those powers got released. Think they re-released some of the hats for a limited time during a hat anniversary or something a few years back, so it would definitely be possible to do the Viking pawns as they already have the designs somewhere.
The visuals give a good feel of the type of power you envision and I could easily see them making a power like this as they already have powers like stoneage, spartans etc that cover different time periods. If I bought powers and liked Vikings, I'd probably buy this.
I do hope there is more feedback on the post though, compliments are great, but I think it would give the idea some actual attention if there was a constructive discussion about the idea.
TLDR; Good visuals, similar powers do exist, but its own power would be fine.