This item is obtained as a Scientist after scanning Undergrove Spore Herder or Undergrove Grimspore, dropping from them onto the ground to pick up.  When placed next to a hostile mob, the Undergrove Sporeling that spawns from it will be attacked and will fight back. It's possibly or simply a method of distraction to bypass nearby hostile mobs without needing to fight your way through an area.

I really don't know what the purpose of this is. It shows up in your inventory as Undergrove Spore' only usable in Wilderrun. So, in Wilderrun, right-click the spore, you get a circle target on the ground, and ta-da! you get this thing (see pic) ... 'Fodder' ... still don't know the purpose ... maybe as a distraction for something else? Anyway, it disappears after awhile. If anybody has more info, I'd like to know.