I'd say no. It's either FMV or it's a variant of streaming animation. I think the only exception would be like It Came From the Desert. FMV but the BG is a non moving layer/plate.
Popful Mail isn't FMV by any stretched of the imagination (IMO). Chuck Rock II doesn't look like it either. Just streaming animation. It's variable rate, it's on different planes, and moves around separately and at a higher temporal resolution than FMV can deliver on these target systems, uses mirroring, etc. I'm think FLI format was like this.
I like it better then FMV, but of course it doesn't lend well, or at all, to real live video/stills.
The PCE could have done this with SCD card, easily (ACD, even better). No idea why they didn't. You stream packs of data and ADPCM data. Key parts need to buffer in the heavy animation parts, during the still or looped parts (cycled animation). And Sega pulled got the idea right

But wtf, only two games???
As cool as the animation is for SegaCD Popful Mail, I dislike the low color count and color scheme (the blue and red is washed out).
Not sir,... I don't like it.