tf is Pi coin. I get these too.
Discussion
No idea
I'm aware of it only because unfortunately I'm "the crypto guy" to a lot of my friends.
TLDR, it's a data harvesting scam. You install the app on your phone. You press a button to "mine", the coin. As far as I'm aware It's not available to buy or sell or trade anywhere. And the app has access to pretty much everything on your phone.
