Tamaru was never released as a set
Hm. I guess I just assumed so since they have a set form image there. There were several "bonus" sets, and with our Set DB not working I couldn't check. I suppose the page would have mentioned that though, huh? So are we left with only MNOG2 for the bluegreen thing? *thinks*Well, no. Kongu's bluegreen was cyanified in MNOG too, so it's logical to conclude the same for Tamaru. Anywho.
As for colours, the electric-looking teal (or cyan) in the first MNOLG is just an overly bright interpretation of McToran Kongu's teal.
Right; cyan itself is a form of bluegreen technically, but most people don't realize this and just think of it as blue. Anyways, point is, the cyan is non-canon.