Can someone explain the twin shadows icon

Actually same... I see an old man with a beard...

Yeah that's what it looks like to me. I never know what some of these icons are really meant to be... that one is so old they should have updated it XD

I tried to figure it out a long time ago and gave up [sg-lulu]

It's a ghost of a manta ray obviously.

I always thought it looked kind of like a bow? Shooting a shadow?? But upon closer inspection it looks more like a ghost with a posh necklace, as you said.

Looks like a yeti/monster thing with it's mouth open.

Looks like vaatu or Raava from the legend of Korra tbh