No they may not. Greenskins in a Chaos Dwarf army are not part of a free Orc and Goblin Waaagh!, they are slaves and do not have access to the magic banners in the Orcs & Goblins book. Note however that due to the White Dwarf update (see Q&A above) a unit of Orc Big "Uns and Black Orcs may carry the magic banners available to the Chaos Dwarf army (e.g. The War Banner and The Banner of Slavery).
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