The short answer is: No he doesn't. Greene does his best to make Pyle as naive as possible as he stumbles around Vietnam seemingly creating havoc wherever he goes.
However, the reader's knowledge of Pyle comes from Fowler, who is himself a "flawed" character. This begs the question: Can we trust Fowler's assessment of Pyle? Much of this great book is based on the mistrust and cultural misunderstanding between the Americans and the Vietnamese. In the end, it is tough to determine whether or not Pyle's innocence is genuine or a clever disguise.