It's possible:
* The name is spelled differently: Perhaps there's a slight variation in spelling.
* The individual is not a widely known actor: If they have only worked in smaller projects or regional productions, their name might not be easily found on online databases.
* You're thinking of a different person: It's always possible you're mistaking this individual for someone else.
To help me find the information you need, could you please tell me:
* Do you have any additional details about Marshall Hambro? (like age, location, type of roles they play)
* Do you remember any specific movies or TV shows they might have been in?
* Could it be a different name you're thinking of?
With more information, I can help you find the projects you're looking for.