What is a small accordion called?

I saw someone playing one of these on a trip that I am writing a piece about and I have desperately been trying to find out what they are called so that I can refer to it.

Almost everything that I have come across still calls them accordions, technically, but the other terms that I saw used to describe these smaller versions were "squeeze boxes" and sometimes they are even called "Cajun accordions".

Hope this helps!