The Palace Guard appears to be a troll, possibly related to Rockwart.
Usually found guarding palaces, the Palace Guard has green skin and wears heavy reinforced armor.
The Palace Guard doesn't appear to wish harm on the Yolkfolk, simply wishing to keep them out of certain areas. However, like most trolls, he is corrupt at heart, and will quickly let an egg sneak by in exchange for a good bribe.
The Palace Guard appears physically impenetrable with armor on top - however, a weakness for gold provides a simple alternative to a physical confrontation.
The Palace Guard has guarded palaces in the following games: