Yes, Skrikits are basically green cockroaches, and Scoots (you might recognise the name Worry Fish) are squid-like fish.
Well done Paramite Pie - you repeated the topic's title in its 12th post.

But yeah, there's a lot of creatures on Oddworld that OWI haven't put into any games. Just do a search for 'kinto', 'skeeter', 'stang' or the like, and you'll eventually come up with the answers.