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
for LEGO Star Wars Minifigure Clone Arc Trooper Havoc Custom Cape Cloth Lot Set | eBay
Lego Star Wars Helmets Clone Army Customs Arc Trooper Colt Helmet
LEGO Star Wars : The Clone Wars - ARC Trooper Fives V2 | Flickr