Yes, in China, it's a different app, called Douyin. (This is probably why the icon looks like a letter 'd'.) ByteDance says they're operationally separate from TikTok as of 2019.

https://apps.apple.com/cn/app/%E6%8A%96%E9%9F%B3%E7%9F%AD%E8...

https://www.cnbc.com/2019/11/27/tiktok-moves-to-separate-app...