Are you talking about BLM Tac 4 & 5? They appear to be listed under the Idaho Federal frequencies for the Boise District. They are considered areawide frequencies, so you need to look at the State of Idaho page to get there.
Otherwise it could be a name for any of those generic unlabeled "Ops" frequencies or even a frequency that hasn't been identified.
I think they were on there own Tac that's not been identified. BLM Was out with them so they may have been on BLM's Tac's. Ill monitor BLM's tac Freq's next time there's a fire out here and see if that them there using.