Can I download TikTok on iPhone?

No you can't. The app has been banned by law and it's illegal for Apple to provide the app.

See this --> About availability of TikTok and ByteDance Ltd. apps in the United States - Apple Support

You can use TikTok on a web browser.

LindaLouLou2 wrote:

can I download tik toK

No.

IMPORTANT UPDATE:

The TikTok app has returned to the App Store.

Good luck! 👋🏼😉