I figured it out... I think.

"Riperamu" is supposed to be "Riopuramu"... based on the Katakana quoted on Robotkingdom (all the online stores seem to be missing the "o", making it less obvious). That then "translates" to LeoPrime. This would appear to be the name (or placeholder name) for the JP Thundertron toy.
(considering the character this toy is based on, I don't think Leo Prime would be appropriate, so would expect the Japanese name to be the same as the Hasbro name of Thundertron)