So if you're frustrated with browser crashing from the infinite scroll, and Tiktok doesn't let you sort the videos by Newest easily do a 2nd pass later on, use this process.
1. Google "original sound hemissme site:tiktok.com" under the Videos category, then use Tools to limit the post time to within past 24 hours if you're doing a daily scan for instance. "original sound hemissme" is the attributed music sample in the posts that unites this trend; no consistent hashtag like #mannequinchallenge did though I think #fyp is used frequently but it's not exclusive to this trend. It should be present in EVERY video search result that is relevant because of how tiktok does its search metadata.
2. Copy the tiktok link to each post you might want to download into a file as your backlog.
3. Use https://tokdownload.com/ to bulk download from this backlog oldest to newest. It's ad/virus free and fairly reliable for up to 25 videos at one go. Pretty fast too since these clips are only 5-7 seconds each.
I've scraped about 4000 videos using this process so far. Most of them are pretty average with the freezing but if we get up to millions of videos that's a huge mine and bound to be lots of goodies
