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
Hammer - ARC Trooper | As the fourth and final installment t… | Flickr
AV Phase 1 ARC Trooper Hammer – SW Fanatics Store
Arc Trooper Commander Hammer Custom Figure Star Wars The Clone Wars Tcw
Arc Trooper (Hammer) by maharlika13 on DeviantArt
Lego Custom Star Wars Helmets Clone Army Customs Arc Trooper Hammer Helmet