Yellow Scouts are an upcoming variant of lime scouts.
Only one has been encountered (so far).
There are no pictures of these folks, but there is also some information about these.
Yellow Scouts use Australium Gold on some of their cosmetics, which is how they got the "Piss" or "Yellow" in their name.
Unlike Lime Scouts, they are docile and are very calm.
These folk also like to use items that are cheaper than the usual lime scout loadout, or anything that they have.
Yellow Scouts will leave out any item that their team needs.
If a Yellow Scout(s) sees a Lime Scout (unless if they are on their team and/or not toxic, which is extremely rare) they will immediately begin attacking.
Yellow Scouts do not mind people killing others, even if what they are killing is a friendly or another Yellow Scout(s).
This is all that is currently known about Yellow Scouts/Piss Scouts.