new chum

noun3

1. •
   (disapproving, old-fashioned) A newly arrived and inexperienced immigrant; a newcomer.

   • Once, said he, a new chum came to the jarrah bush. A new chum is a tenderfoot, specifically an English tenderfot; he is, of course, the butt of every bush and mining camp in Australia. — 1915
2. •
   (Australia) A beginner; a novice.
3. •
   (Australia, no longer used) A newly arrived convict.