Alpine Lake Air.
I flew into Spatsizi/Coldfish Lake with them in 2019. They operate a Cessna 206 on floats out of Tattoga Lake. Payload is 800 pounds.
The company also has a Cessna Caravan on floats but it is not usually stationed at Tattoga.

The 206 is not a big plane. OK for 2 hunters, each with gear for a backpack type hunt (pretty darn light- 60 - 70 pounds of gear/food) it will be OK.

Depending on planned length of trip, you could bring in extra food and leave it at the guest cookhouse at Coldfish LK and re-supply yourselves as needed.
If you get a bou, goat or sheep you should be able to get yourselves and animal out in 1 trip. Moose would need 2 trips.