First one that I have seen.

Kayvon Thibodeaux - Oregon

He will be declaring for the NFL.

https://www.espn.com/nfl/story/_/id/32808307/kayvon-thibodeaux-declare-n...

Added Nik Bonitto
https://soonerswire.usatoday.com/2021/12/06/oklahoma-sooners-nik-bonitto-opts-out-of-alamo-bowl-declares-for-the-nfl-draft/
Added  Alontae Taylor
https://www.rockytoptalk.com/2021/12/1/22813298/tennessee-vols-football-alontae-taylor-nfl-draft-skip-bowl-game
Added Amar'e D Barno
https://twitter.com/Ayye_Barno/status/1467902221203427341