Is this an appropriate place to ask for help identifying graphic design products? (e.g. web page designs, calendars, posters, etc)
I think Identifying a physical product or style is very acceptable.
Tha tags terminology and style-identification can be used for this. Say you saw a type of trade show display but didn't know a good way to search for it online. If you post an image and ask for help with the correct term to use, then I think its perfectly acceptable. As long as its a design related product of course. Even simple things might be taken for granted by some - there was a time when I didn't know tri-fold as an example. If I posted an image of one looking for the correct term, this seems okay to me.
I will say though - try to identify it on your own. Say what type of search phrases you used that turned up little or no results, otherwise it will be downvoted as poorly researched / lazy.
On the other hand, if you're asking for something specific like posting a single page out of a Hooters Girl's Calendar (sorry, it was the only well-known calendar I could think of) and asking us to identify which year and month it belonged to. This would not be okay. Or describing a vague idea of a logo or website and asking us to tell you what company or website it belongs to: again not okay.
I don't think these types of questions would work very well within our community. Stack Exchange sites strive towards reusable knowledge; questions that are likely to help many are considered better than ones that only help an individual. It's difficult to imagine these types of questions going beyond a "single serving".