No, Craig Robinson isn't in Clerks III.
Craig has just signed on to be in Kevin Smith's "Zack & Miri Make a Porno."
The Hollywood Reporter states:
""The Office's" Craig Robinson and former porn star Traci Lords have joined Seth Rogen, Elizabeth Banks and Jason Mewes in Kevin Smith's "Zack & Miri Make a Porno.""
Read the article HERE.