Is there any SE site where I can ask users tell me/help me find what the font used in some media (movie, picture, whatever) is? If so, which one?
Graphic Design’s help center and the tag info link to this meta question about font identification questions: What are the requirements for font identification questions?.
To summarize: you need to show your efforts (e.g. with the tools from the tag guidance), give as much details as possible about the font (source, screenshot, etc.), and make your question title specific.