TikTok has a ton of videos for Oreo Sushi, which happens when things go viral. And of course, searching by hashtag doesn't yield chronological results. The oldest video for it that I can find is by @miluvia, from April 2021. The most popular one, though, is from @siennas.sweets with over 8 million views. That's the best I can find. But I'm old and don't use TikTok and heard about it when Pete sent me a video of it on Instagram because we're old and we don't have TikTok accounts.