no, it wasn't either of those, but they look interesting. funny how i've never even heard of Plok, even though i do a lot of SNES emulation...
The only other fuzzy detail I remember about this game was that one of it's levels was a very tall, forest themed level in which you went through (at least part of the level) by going to the top of the trees, then back to the bottom in an up-down weaving motion.

sorry about that ridiculous description, my attempts at ascii art failed