On Meta SE, synonymise:
While technically there is a difference between locked answers and locked questions, the vast majority of posts relating to locked posts apply to both. In fact, this is the only question I could find that is exclusive to locked answers and here a tag helps little with finding the question or similar. While these tags could theoretically be disentangled, this does not seem to be worth the effort. Also, it is difficult or impossible for askers to discern whether their question is exclusive to one type of locked posts and thus which of the existing tags is most appropriate.
Therefore, we practically have three distinct tags with a strong overlap. This makes it more difficult for users to find questions on this topic and yields unnecessary confusion when tagging posts.
I suggest locked-posts as a target tag to avoid confusion with locked votes, which are a separate thing.