Couldn't sleep so did some search, and given the paucity of images or information, I can easily believe that these characters were not very popular...
Here's what I found.
http://disneyshawn.blogspot.com/2011/04/no-foolin.html: "...the new park would feature a cast of characters all its own, from Dreamfinder and Figment in Future World to the People of the World in World Showcase. These oversize, doll-headed characters were adapted from America on Parade, which ran at the Magic Kingdom in the mid-70s."
And as a paranthetical on another page, I grab this excerpt: "...wander through the World Showcase extravaganza and see any one of these one hundred twenty dolls of various nationalities..."
Apparently, they wandered freely and so would be seen outside their "native lands" if they even had one in World Showcase, and looking closely at the image that started this discussion and the details of the costume, I would guess it as Mexican?
Jud