I don't think that the pedagogy tag, as currently defined, will be useful.
"Relates to the method and practice of teaching" seems liable to confusion with teaching to me.
I don't think I could reliably determine which questions should be tagged pedagogy instead of/in addition to teaching, and I suspect I'm not the only one. (And the upvotes on this comment suggest that others agree.)
This is not to say that I think "teaching" and "pedagogy" mean exactly identical things. But, I'm concerned that in practice, the distinction is too fine for many users (and the excerpt is not very helpful in clarifying the distinction).
I don't think it's productive to have a pair of tags that only a small portion of users on the site can actually distinguish between. Tags that are subject to misinterpretation or misuse are bad for the site.