. . . don't exist.
But because it's finger squid season in Texas, I've been reading up on the closest approximation to a freshwater squid: the Atlantic brief squid, Lolliguncula brevis. It's a pretty great name for a pretty great squid. The latin name just rolls off the tongue: lolly-gunk-you-lah. And "brief"? Like these? Oh wait, those are squid briefs, not brief squids . . .
I think the brief squid was named for its diminutive size.