Found out that this unnamed LEGO Arc Trooper is actually a named Clone in Season 3 episode 2 (“ARC Troopers”). He is seen for a few seconds and goes by “Hammer”. I
Arc Trooper Hammer Clone Set — The Cape Cantina
I finally got my hands on Arc trooper Hammer! It will make a fine addition to my clone army I'm building. : r/legostarwars
LEGO MOC ARC Hammer by wyattjjbricks | Rebrickable - Build with LEGO