>>43378505>>43378925a. You're overthinking things, it's pretty clearly a black muppet Ghidorah. "Drei" just means three (for the number of heads; the Japanese name, Sazandora, contains san, the Japanese word for three), lots of countries used tanks, and black is the most obvious color for a Dark-type.
b. Even if you're right and it IS supposed to be a Hitler reference, this is from the same country that made Starfish Hitler for the sake of a shitty pun. Why are you surprised.