Oh, you would have to ask that. I don't remember. I just call it flutter like 99% of all modelers. However, if you ask over on the aerodynamics forum, where guys can get really picky about exact terms for these things, you might get an answer.

More to the point, when you go searching for info on flutter in aerodynamic books and websites, they always are talking about the whole wing or stab fluttering around, they don't mention the control surface moving while the wing stays still.

But, really, who cares .