When looking for information on the Gougou, the ideas can be all over the map. I found stories of a giant sea serpent to a ghost-like forest apparition. Most modern stories make it out to be just another Sasquatch. But my issue with cryptozoology stuff is that the pseudo-scientific method purports every local legend to be Bigfoot or a lake monster.
Digging further into the old native legends and the folklorish accounts of early French explorers I found something more interesting. The idea that the Gougou was a giant ogress. Now ogres are a very European monster, so I rather like the idea of a North American species (I always thought we've got great forests, we just need some good ogres, ettins and trolls roaming about). I am not entirely satisfied with my sketch, but I could only stand to look at photo references of large unattractive women for so long.
According to the tales of the explorers, the Gougou appeared like a giant female beast moving from the waters to feed and then disappearing into the forests. The stories don't just tell of her being an eight-foot sasquatch creature, but a thirty meter tall ogress with the rainbow shimmer of fish like scales across her body.