This is a really cool, and really odd old Bandai toy!

I have no clue what it's called or anything. It's a Hippo, but with tank treads and a sci-fi theme. When he moves forward or backward his jaw opens slowly and then slams shut violently. So cool... The Bandai logo is the 1950 to 1961 logo, but I can't find a sliver of info on this cool chomping Hippo Tank remote control. It works too. Has anyone ever seen anything like this guy?