A smaller range might be H-H-N-G on two phases but the larger ones take power from all three phases, so they're H-H-H-N-G. With some models now being sold right across Europe, we're seeing some of these in the U.K. (here we just strap all the phases together for the British single-phase residential service).
I think 3-ph ranges have been quite common for some time, although I'm a little hazy on the history of French power distribution. A few weeks ago I stripped out an early 1970s British range here: It was wired for 1-ph with only a single L1 (line/hot) terminal, but the block had empty positions clearly marked L2 and L3, which I assume would have been used for some export models.
When you mention the brewhaha over range wiring there, I assume you mean about using the neutral as a ground rather than a separate ground wire.
To the best of my knowledge, nowhere else in Europe (Western Europe at any rate) would ground the frame of an appliance to the neutral. As in Britain, the neutral & ground are kept entirely separate after the service entrance, although some areas have the main house ground to the neutral as in the standard U.S. or British PME systems.
No, there's no ground pin to cut off on the French plugs, but a lot of older buildings seem to have non-grounding recepts. without the ground pin. There's nothing to stop an appliance requiring a ground being plugged into one of these.
