The phrase "new librarian" refers to a person who has recently started working as a librarian or someone who has just joined the field of librarianship. Full definition
In the hands of great new librarians just entering the profession, the future is bright for school libraries! (aasl.digitellinc.com)
Likewise, I met — in person and virtually — many newer librarians with whom I plan to stay in contact and perhaps collaborate in future. (slaw.ca)
I blog about new librarians and library school students which is a passion of mine and you'll find many of my posts written with that audience in mind. (blog.feedspot.com)