Tether and Circle can freeze USDT and USDC at the contract level, and both blacklists are public — this page reads them live from the token contracts on Ethereum and TRON, including the address's same-key twin on the other network. No account, nothing stored.
If money was stolen from you, the freeze status of the thief's addresses is one line of a bigger picture. Run a free scan to see where the funds actually went, and see where to report the theft in your country.