Interesting. Native Americans have a story about a race of large people with red hair. I suggest that before the flood the Earth had higher co2 levels, and those high carbon levels made it so that people could be much larger.. perhaps the nephilim were this large race.

I suggest watching the documentary "is genesis history'

https://youtu.be/UM82qxxskZE?si=BKaPgfZnkP6sL9lj