It’s Pohatu Uniter!
Actually, these figures show up in the boxart of Strakk, Vorox, Tarix, and Skrall, too. The one on Vorox’s is a Sand Worm, Skrall’s has a Giant Scorpion, Malum and Strakk have Glatorian that are most likely early concept art of Vastus and Kiina, respectively, and Tarix has some kind of centipede thing.
So, to answer you question, it’s Vastus.
~W12~