those are crappy cross country style roller skis that google finds.
Ive actually thought of this before and have searched the web thouroughly and have only seen park ski's in ONE other place.... Woodward in Pennsylvania. An older style it appears.
I am currently in the process of destroying an old pair of skis trying to reverse enginner a pair of park skis by just referencing a picture of them on their tahoe site. If i am succesful i will post a write up of the process and the cost i put in it, or ill just post pics of my failure. Either way, knowledge is power.