I do not have sufficient rep to do so, and this answer indicated that asking here was the correct way to flag for merging.
There is misunderstood with "Foundation Framework" and "Zurb Foundation". Simply check on Google and you will spot the difference: https://www.google.fr/search?q=foundation-framework
These two tags must not be merged or became synomyns because it's (in fact) two different things: foundation-framework is related to Objective-C Foundation framework development but can also be related to the Foundation Framework from Zurb.
I have retagged questions related to Zurb Framework which have foundation-framework tag.
I think, we just need a description for foundation-framework to define exactly what it is and what is not, inside the excerpt. Like:
I don't know Objective-C, but maybe this tag can be killed ... (17 questions in the whole Objective-C questions on SO).