Fresnel spots are one of the traditional studio-lighting tools, carried over from theatre and movie work; they allow focusing the light from wide to narrow, just like the zoom function on a flashgun. For example this one from Elinchrom, or these Broncolors.

The reason you don't see them often is that, like a scrim, snoot, honeycomb, or other tools, they're a fairly special-purpose device that gives a particular look; one you don't want all the time. They were widely used in the 30s-50s in Hollywood movies and studio photography, which today gives them a fairly 'retro' look when used on their own, but they're still around (and are still the workhorse lights of theatre and movie production). I'm not a particular student of lighting trends, but I'd describe them as slightly harder light than is currently fashionable for portraiture.

On the other hand, flashguns have a couple of special properties that make a fresnel lens attractive for that application. A big one is effciency: Since power for flashguns comes from batteries, this is a much bigger concern than for mains-powered studio lights. The fresnel helps to focus the light to the desired field of view, and so the same power can be used to produce a higher GN (or extend battery life with the same GN).