#naamon

The Godzilla series has a myriad of unique kaiju,and in the 1970's Toho released a series of audio dramas on vinyl called Our Monster Unit (われら怪獣部隊) that added some more! According to MyKaiju.com, the story follows a young psychic boy named Tadashi and his adventures with aliens from Planet Alpha and Godzilla! Each episode they fought a new kaiju. They were:

Nahmon (or is it Naamon): An underground kaiju that generates earthquakes. His episode is the only one I've been able to find (via MyKaiju.com linked above, though it is in Japanese with no translation).

Underwater Monster Balwalar: The green fellow with saber teeth. I was not able to find a more complete picture of him (the rest of the monster's head folds out from the vinyl jacket, but it seems no one has thought to do that for pictures...)

Galaxy Monster Killerstar (or is it Kirastar? Maser Patrol and Wikizilla have different translations) A space monster that looks like a cross between a frilled lizard and a gecko with antenna. Appears in the final episode. You can see how the cover flips out to show off more of the kaiju.