Texas worms exist, definitely. In our region of the state, I've mostly seen very skinny and small earthworms. The soil here in North Texas is mostly clay in a lot of places, plus it gets very dry in summer, only a masochistic earthworm would choose this place. In East TX and/or down near the gulf there are probably plump worms a-plenty, considering they get more rain typically. Side note, there are a lot of other kinds of bait worms available up here, not really sure if they're locally sourced worms though.

I've always wanted to visit the Pacific Northwest to experience the rain forest and its many denizens. :D