I don't remember the URL, but someone has Beavis and Butthead. The site belongs to Hasbadril (I've probably spelled it incorrectly). He has several cartoon-based figures at Animotions, assuming they still have all of their links up. I haven't seen Ren & Stimpy figures, but I wonder whether static models might be available at 3DCafe or one of the less Poser oriented 3D sites....

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.