While it was super awesome to have Grungs introduced, there wasn't anything amazing about this document. The first page is an intro to Grungs, then an advertisement for a Stream. A few NPCs are introduced and that is it, no adventure hooks, no basic Grung village map, not even a page on Grung hierarchy and culture. On top of that, it does not make the Grung an offical playable race. It's fun, but it should have been around $2.
[3 of 5 Stars!]