I've seen people do this egregiously - the last startup I worked at people almost seemed to just make stuff up on LinkedIn for their title, that knowing their official title and actual responsibilities was BS (although some people had real internal titles that also didnt really mean what they said in the real world.) A lot of "lead" implying "the lead", when it really meant "senior" as in there are many, it means you have 2 years work experience and no reports. And a lot of "head of" when what was headed was 2 people, but framed as a region or service line.

I have subtly played with my title occasionally, to try and reconcile it with normal industry titles. But I've found it doesn't change anything, and have reverted to just putting my employer given titles and explaining them, as the other comment said