Fresh meat
American SlangDefinition
A newcomer—especially an inexperienced one—viewed as naive or exploitable and likely to draw extra attention or hazing.
Examples
"Orientation wasn’t even over before the seniors started calling the new dorm arrivals “fresh meat.”"
"The veteran sales reps eyed the new hire like fresh meat, ready to dump their worst accounts on her."
"In the ranked lobby, the clan tagged him as fresh meat and farmed him for easy wins."