No, they don’t. https://en.wikipedia.org/wiki/Digitally_controlled_oscillator
And yes, the Four has DCOs. The Rytm has VCOs.
You don’t need to confirm anything by assumption, I’m telling you the facts here…
Digital control doesn’t equate to DCO, as I wrote above you can send CV from a digital source - that’s a form of digital control. You have digital control of the VCF (Four/Rytm), VCAs… Etc… They aren’t DCF or DCAs because of that fact. The point being the system in its entirety - digitally controlled, analog sound generation.