It's possible:
* The name is misspelled. Could you double-check the spelling?
* This individual is not a well-known actor. Many talented actors work in smaller roles or projects that don't have widespread recognition.
To help me find the right John Ammonds, please tell me:
* Any other details you know about them, like their age, nationality, or any specific roles they might have played.
* Do you have a link to their profile on any online movie database like IMDb?
With more information, I can try to find more information for you.