Once the Froglok Escort spawns, defend him! He triggers an event where mobs will run to him and try to kill him. Kill these mobs and eventually "an escaped froglok"s will spawn that drop busted froglok slave shackles needed for the Granite Pebbles and part of the Geozite Tool quests.
So far, I've seen two different escorts: a "Froglok Escort" and "a froglok escort". I did notice some behavior differences between the two.
The non-capitalized ones tend to wander about just like the rest of the frogloks in the area, and I've seen them in several different places near the East Cabilis entrance: near the trail area on the left side (if you're standing away from the EC zone entrances, facing towards the 2 buildings), and on the island across from the newbie area.
The Froglok Escort tends to just stand around, specifically in that left-side-path area (I left him alone and just watched him), and the time that he actually moved, he went up the hill, turned and continued moving, parallelling the zone wall (going past the brigand camp), and turned again into the center of the swamp, into what appeared like the Froglok village area. I backed off at that point (being level 10 at the time).
They both drop the same items (the Froglok Escort Fife, and Bixie Berry Pie), but I have a feeling that the capitalized-named one has some other purpose, beyond the obvious one. I tried to hail him (successful sneak), and he ignored me.