Bubble is not really optimal for this as it supports only absolute positioning (and no design constraints) and therefore is not optimal for more complex mobile interfaces. A TikTok clone on bubble will likely not be as smooth as the real thing (probably by far). Also, creating the whole content logic part behind tiktok (i.e. analyzing what is in a video and then identifying what videos to show to each user etc. is a pretty tough data science task if you want to do it well…)
In any case, our template (https://bubble.io/template/mobile-app-ui-pack-1586972825540x237128367982510080) includes a very basic tiktok like video feed (just a simple video feed, without all the intelligence behind it). See here for an impression: [New Template] Mobile UI components library
Important: The template uses paid plugins (see documentation for more details: https://www.notion.so/Mobile-UI-Starter-Pack-Documentation-7ae910995dde4dadabbe615c6d94bfdd