You can see a group of bright blue frog-men moving towards you, carrying spears. In keeping with the party's message (and Engelhart's encouragement to let them pass), I'm depicting them just now before the climb over the log in the middle of the trail.
There is a small chance that they will see you as they approach. I'm discounting armor and weapons, but giving -3 for the forest and a bonus of -5 to the stealth distance on account of your cover. That put you at -8 overall.
At the moment, they definitely don't see you, though they are clearly patrolling the path, checking left and right as they move along.
UPDATE: From the lack of comments below, I'm going to assume now that the players have no intention of changing their positions or taking any other actions until the froglings (good, we'll call them that) get a lot closer. Therefore, I'll post another image, hoping to get a response.
On the right, you'll see that the frogs have dropped into single file as they cross the log. The lead frog moves up to 0507 [I'm sorry, some of these numbers are difficult to read, I'll see what I can do for the next image] and stops. It turns, sniffs the air, and looks directly at the rock edge at 0707, which you'll remember is 7 feet high from the creature's perspective. It is quite evident at that point, particularly to Embla, who is flat on her belly and looking straight at the creature, that the party's presence is, at the very least, firmly suspected. The frogling leader looks back at its companions and raises an arm.
It is the player's move at that point; act, do nothing, let me know.
Oh and PLEASE, people, Read the Comments of Your Fellow Players when picking targets and entering hexes!!!