The fact is that turkeys sometimes make noises that are unusual, someone hears it, gives it a name, and all of a sudden we have a new turkey vocalization. If the person that hears it has some level of notoriety as a turkey hunter, then the new call name is even that much more valid and authoritative.
The problem is that these rarely heard sounds are so rarely heard by the masses that no one really knows what they are, so we end up with all this speculation as to what a certain turkey noise is supposed to sound like. We just recently had this same discussion on another thread about the "quaver" or "quavey".
It is like people spreading a rumor down the line. After a while, nobody really knows what the truth is, or even what the original story was about. Same with turkey calls. What people call one thing on one end of the country is what the guys on the other side call something else.
Now, back to the original question. I have heard multiple gobblers on two different occasions make sounds on the roost in the morning that I can only describe as being similar to an owl hoot, but not quite. Were these the mysterious and elusive "wildcat calls"? It's anybody's guess!