Some tag info pages show who created the tag:
while others don't. I'm pretty sure I created that one as well, if you hover over the timestamp you can see when it was created:
which more or less matches with this edit where I created the tag:
I understand that some tags like discussion were probably created by the Community user while the site itself was created (so it doesn't show an author), but some newer tags like winter-bash don't show an author either even though the creator still has an account here.