Coming in a pouch the same size as Big League Chew, the oddly named GODZILLA HEADS was made by Amurol, a subsidiary of Wrigley, in 1988. As the label says, it contains "Fruit Punch Head Shaped Bubble Gum" which is pretty bizarre on its own...although mine feels like a bag of rocks, as you can imagine. I'm curious to see how detailed the head shape was, but I'm not about to open it. This product was changed to GODZILLA SHREDS, making it even MORE like Big League Chew, with the same packaging.
On a side note, the same company made KING KONG SHREDS, but so far I haven't run into any "KING KONG HEADS" out there, but anything's possible. Toho IS credited on the label, so I guess they must've licensed Kong too.