Is this the dreaded torpedo grass?

I don’t think so, looks more like young centipede, but maybe carpet grass or Bahiagrass? Send photo to Dr Ron Strahan, weed and turf professor with LSU AgCenter, rstrahan@agcenter.lsu.edu, he’ll likely be able to ID it for you from the photos. Let us know what he says, curious myself.

If it’s mixed in with your good lawn grass like centipede, St Augustine or bermudgrass you can kill it with MSM Turf, that been discussed in other threads, without killing the “good” grass. I did have a bit of a bahiagrass problem, but eliminated it MSM Turf. Or if just along your foundation where you don’t want any grass at all, just use glyphosate.

Yes i use it predominantly during high temps

Yes and no. If you don't plan on killing the weeds then I wouldn't go throw fert out there. If you plan on ferting and spraying the weeds then you can.