Interesting -- where are you looking at these bikes?

Yeah, I think you're on the right track; "cromoly rigid" is a rigid, non-suspension fork made of cromoly steel.

The components lists you're seeing, I'll bet, were drawn up by the store with the expectation that most of the bikes they'll sell would have front suspension. So, whoever was in the back office at the time was directed to make a list of features for the bikes, including whether it's a boy's or girl's bike, whether or not it has fenders, what kind of front suspension it has (rather than "whether or not it has suspension", if you see what I mean), etc.