I've killed roughly 100
Drops -
1x Giant Grub Digger
1x Hammer of Flattening
1x Lumberjack's Cap
4x Forest Loops
Quite a few "misscribed gate" and "misscribed lifetap"
Every single giant dropped 1x Evergreen Ivy Ringband
No giant tree flayer, forest giant hammer or leg-chopper
This seems fairly accurate, although the weapon drops seem kind of low, and I'm concerned that I didn't see a single giant tree flayer/forest giant hammer/leg-chopper in the entire time I was there.
Additionally, the Hammer of Flattening has a
luclin graphic, I believe.