Grunt with toys
From Halopedia, the Halo wiki
The Grunt with toys is an easter egg that can be encountered in Halo 2.
During the opening cinematic of Delta Halo while playing on Legendary, at the very beginning where you see the Grunt, look closely at it and you will notice that he has a Master Chief doll and a Grunt doll in his hands. It is easier to see if you take a picture and zoom in with an editing program. If you have Halo 2 Vista, you can use the detachable cam.
On the other difficulties, he plays with other things. On Easy, he plays with a stick and dirt. On Normal, he plays with plasma grenades. On Heroic, he plays with fire.
The objects disappear shortly before the UNSC SOEIVs' landing on the surface of Delta Halo.
In the Blur cinematic of Halo 2 Anniversary, the Grunt will have toys in all difficulties. This time, a Jackal is holding up a Master Chief doll and the Grunt is batting at it until they are distracted by the SOEIVs.
Gallery
A Grunt playing with two Plasma Grenades, as seen on Normal.
A Grunt seen playing with action figures on Legendary.
