Can I freeze an NFT in another wallet? For example, if I mint an NFT and send it to another wallet, can I freeze it so the recipient can't send the NFT to another wallet unless I choose to unfreeze it? Does Metaplex offer this functionality?
i'm pretty sure you can freeze token accounts if that was made possible when creating the tokens. So i would say that you can freeze an nft in another wallet
Edit: i think both other answers are false. You CAN freeze token accounts, and there is no link with being the delegate.
Check this: https://spl.solana.com/token#freezing-accounts
Delegation let you control over a token accounts (in order to move some tokens for example).
In order to freeze a token account, you should have access to the freeze authority keypair. It's not linked with metaplex, it's linked with Solana SPL token program (see link above).
You can freeze an NFT you are the delegate of. The wallet holding the NFT just needs to sign a transaction approving you as the delegate.
Here is the Developer Hub documentation for how to do it for both NFTs and pNFTs and an explanation for why you must be the Delegate. https://developers.metaplex.com/token-metadata/lock