As I said earlier, the only thing consistent about the Gremlin-verse is its inconsistencies.
I used these two images:

When calculating height, as I feel it gives a pretty unbiased view of their height without things like perspective and posing getting in the way and making measurements difficult; Although, I can see why you chose to use the actual game for your estimates.
Edit: Especially for Teddi and Teddibear, you can see what I mean by their bodies being very unstable for general movement, with their center of mass clearly located somewhere near the chest instead of at the hips for normal humans.
Edit 2: I'm not saying that your sources are inherently worse than mine. I just personally perfer these two as they appear more reliable and easy. The only way we'll know the heights for sure is by asking the big-man himself...
OI, GLACIER, HOW TALL ARE THESE BLOODY DOLLS!