McFarlane Toys/Odd Pods Series 2
From Halopedia, the Halo wiki
Halo Odd Pods Series 2 are the second series in McFarlane's new "Odd Pods". It features The Rookie from Halo 3: ODST. They were released in October 2009. Odd Pods can be popped apart to have interchangeable heads, torsos and arms for countless customization possibilities, similar to how action figures have interchangeable armor.