Ghost Jams are events hosted by the Ukagaka Dream Team, wherein participants must create a new ghost within a certain timeframe. Exact rules vary per event.
Ghosts that have been made as a part of jams are indicated with the tag Ghost Jam. There are also tags for each individual event.
Not all ghosts that have been made during jams have a public release, and as such, will only be mentioned on the jam pages themselves rather than having a separate listing.