You have probably seen this at some point in your travels. It's almost a Gigan figure, but if you look closely, you will see that whoever designed this thing completely missed the hook hands. But, hey, good try.
The yellow figure on the right, I have had for some time. The one on the left is a brand-new acquisition, and somehow it's an inch shorter than the yellow one. At one time I had operated under some mis-information and thought that Imperial had made this, around the same time as their 1985 Godzilla (they didn't), but nobody knows who did.
I can tell you that both just say that they were made in China (on the feet), and do NOT have any Imperial logos anywhere. So, it's basically what collectors call a "Chinasaur," and just an interesting collecting oddity.
The list of Godzilla bootleg items is a pretty interesting one, and could be a whole topic in itself. It's one of those lists that grows on a daily basis, and will never stop being added to!