Yes, you can transfer NFT fighters to another player's wallet through Polygon.

Go to the official website, select the NFT fighters to be transferred in the Inventory, and transfer them to the other party's wallet address.

After being transferred, the NFT fighter will be marked as being transferred for 24 hours, during which it cannot be used to earn tokens in-game (it will be considered a non-NFT fighter).
This does not impact withdrawing, selling, or transferring the NFT  fighter.

Also, be aware that once a fighter is transferred to another wallet, their level and ascension tier will return to their starting point, and they will need to be leveled up and ascended again, but this will not require ascension materials.