Attached is an image of three frogs inlaid with shields. One has been 'attributed to' a famous archetier of what some call the 'transitional' period, but whose known works are seldom seen. After a lengthy study of similar work by other masters of the same period, I am convinced the attribution is incorrect.
My question is:
Can anyone identify their country and city (or cities) of origin, or discern the maker or makers?