scamigrant 

An individual that comes in on a raft to claim housing and free money when they have no reason to need it.

Another load of Scamigrants washed up at Folkestone today.

scamigrant by Betty bopper March 26, 2023

STEMigrant 

A foreign-born advanced U.S. degree holder able to fill highly specialized roles in science, technology, engineering, and math (STEM) fields for America's most innovative companies.

Many Silicon Valley workers are in fact STEMigrants.

STEMigrant by Intelligencer May 30, 2018

Spammigrant 

A chatter who joins a forum or chatroom after seeing it advertised in a spam message

Bob: "who's the new guy?"
Alice: "oh, he rode in on the latest wave of spammigrants"

Spammigrant by ColdBrrBrr May 11, 2018