That seems to be the prevailing theory, although it has not been confirmed. I know there's been a lot of discussion of this on the following thread:

http://www.zombiepodcast.com/forum/s...oed-Ones-Oh-My!

You'll notice a lot of people will use the names interchangeably, depending on their personal preference. In this thread, I was specifically thinking of the one Kalani and Riley encountered at the Hospital, who we heard laugh.

I'm probably alone in thinking I heard the laugh again in this chapter. But then again, my hamster has the same evil laugh, so it might just be me.