1 - Humble Origins
This is near the Excavation Camp, where you have to go to for a mission.
2 - Monster Ass
This Typhon Log has a nice view towards the big monster spine.
3 - The Pandoran Handshake
This log is also easy to find, overviewing the plains.
TYPHON DEAD DROP
The Typhon Dead Drop is near a big bug nest area.
It's easy to access after getting rid of the bugs...