Actually the easiest way to get there is the following:

Cross the "C" plank at the entrance of Guk from the swamp. Make a left and
go until you cant go forward anymore. Follow the room to the right- on the
far side of the room you will see a hall going off to your right. Facing
forward at the start of this hallway you see a door to your left (this is
where the froglok Squire spawns)- go through that door and into the room on
your left. You are now in the "Plank Room".

Cross the plank room and you will see a room with a whole in the floor
(ladder going down to the floor below). Jump down this hole and face the
only exit from the room below. You can get to the first entrance to Lower
guk by makeing a right, however, the Froklog priest is just down the hall
to your left.

The hallyway will turn right then left again then pass through a small room
with one foggie in it (no other exits from this room). Next will be a room
with a number of exits and 3 or 4 frogs. Hang a right in this room and
head dow nthe hall. It will curve around in a "U" shape (kinda) then make
an abrupt left. The room in front of you now has a pit with 4 spawns, and
alclove on either side of the pit with a frog in each, and the hall
continuing on the far side- welcome to the Froglok Priest Room.

Ailamil