There isn't a lot of publicly available information about an actor named Fyodor Valkov. It's possible there is an actor with that name, but they haven't been involved in any major film or television projects that would have gained widespread recognition.
It's possible that:
* The name is slightly misremembered or misspelled. There could be an actor with a very similar name.
* The actor may be relatively unknown. There are many actors who work in smaller projects or haven't had a breakout role yet.
* They might not be an actor at all. The name could belong to someone involved in film or television production in a different capacity.
If you can provide more details about the projects you're interested in, or a description of the actor (e.g., age, appearance, nationality), it might be possible to find more information.