The Kooky Spooks were a series of costumes that included an inflatable plastic head and make up to paint your own face. It's sort of a goofy idea you have a plastic head on top of your own head. Its not even a mask just an extra head. This was back in the days when most costumes were a vinyl smock and a plastic mask that came out of box. The good ones looked basically like the character you were trying to be, the bad ones had that character printed on the front along with their name. So Chachi or something like that. I remember the TG&Y people getting made at me for opening up the little boxes to see if the smock was cool or not. So the inflated head thing isn't totally out of the scope of reason for the time.
The Kooky Spookys were a line of little ghost toys from Hasbro, that came out in 1968. They were cute if a little contrived as they were presented as hippys. The toys glowed in the dark which was fun they needed this as they were more figurines than toys. They had names like Teena Terror, Big Brother Mortimer and Daddy Booregard. You will see some in this little flyer, I think this is the first series there appears to have been more or there were many items for each figure to hold and be posed with.
Someone who blogs under the name have phaser will travel has actually done some of his own custom Kooky Spooks that you can see here. I think they are pretty nice and get the feel of the original toys right though they seem to have taken a bit of a turn away from the hippy flavor of Teena Terror and Momma Kaskit.
enchanted world of rankin bass for this info.
In writing this post I wanted to thank Snagg's News and The Universal Monster Army Forum for pictures I have used.