I like "prompt injection", personally. It's not as pretentious as "prompt engineering".
Even “tuning”, as my sibling comment suggests, is imo a stretch, because it implies some form of finite set of knobs that can be adjusted. Prompts aren’t something that you can simply map to knobs without pushing the analogy beyond reason.
To me, that's like rebranding "software engineering" to "exploit engineering" - sure, one is a subset of the other but they are not the same thing.
Personally, I've never liked the title of "software engineer" or even "data engineer" (my own title). However, those are more rooted in engineering-like practices than any of this "prompt engineering" nonsense.
I would just got with prompt tuning.