These were toys released by Takara circa 1982.
Plush
Assorted Love Monster (もりあわせラブモンスター) keshi/eraser figures
Restless Love Monster (せっかちラブモンスター) wind-up figures. ¥480
Nurse (かんごふさん), Firefighter (しょうぼうくん), Smash (スマッシュくん), First-Love (はつこいさん)
EP Record Rumored Love Monster (うわさ のラブモンスター )
VIHX-1581 1982
Rumored Love Monster (うわさのLove Monster)
Good Luck Baseman (グッドラック・ベースマン)
You can listen to the first song here.