Only Knowledge skill I have trained is Nature, so I'll try that for skincutting, though guessing it won't reveal much. I can try all the others too if it's something that could be known untrained.

Nature (1d20+14)[29]
Religion (untrained) (1d20+2)[9]
Dungeoneering (untrained) (1d20+2)[11]
Local (untrained) (1d20+2)[20]
Arcana (untrained) (1d20+2)[7]
Nobility/Royalty (untrained) (1d20+2)[19]
Planes (untrained) (1d20+2)[9]
Geography (untrained) (1d20+2)[19]
History (untrained) (1d20+2)[3]
Architecture/Engineering (this feels the least likely to offer anything useful at all lol) (untrained) (1d20+2)[20]


I will also attempt to make a general Listen check, and also a Spot check and/or Survival check to see if there are any obvious signs of tracks or camps or any kind of civilization (besides the hanging Orc obviously).

Listen (1d20+16)[36]
Spot (1d20+16)[23]
Survival (1d20+18)[22]