ARBBL

Does anyone use this specific set for Frostgrave?

I was thinking about printing out a set and painting 'em up. But I wouldn't want to tread on anyone's toes if they've already done the same

Not here. I've seen someone use them on Facebook, but never actually seen them on the table.

Could be a goer then?

I've seen people using Lego minis which seems like a brilliantly absurd idea also.

As long as it's clear what's what, anything goes. I've seen pics of people using all sorts.
One of the best bits of the game for me, its mini agnostic so your imagination is the limit (or in my case, my ability and willpower are the limit i.e. none ).