This is my impression. I don't think that we ever use "pot" for such small containers in AE (though others may disagree.) Thus, a tub of yogurt (the more common spelling in AE) and a jar of jam.Shall we say a pot of yoghurt in the UK and a tub of yoghurt in the USA? meaning the same container?
What others are calling a "pot" of yoghurt I would call a "container" of yoghurt in my variety of AE. And a stick of butter (or a pound, or a 'pat' when it's the single serving size found in restaurants). Also a "container" of ice cream.Shall we say a pot of yoghurt in the UK and a tub of yoghurt in the USA? meaning the same container?
Same here. We never use any name of container in French: I'll have a yogurt.Why the way, in Spain, even though we have a word referring to a yogurt container, nobody uses it; we simply say a yogurt, 2 yogurts... What about in your countries?
I don't think I've ever used carton for the small container. "A yogurt" or "a cup of yogurt" or "a container of yogurt" are all fine with me.As is often the case, it depends on where you are speaking English. In AmerEng, the single serving is a carton or a container or, as Myridon noted, simply "a yogurt." It would not be called a tub or pot, which seem to be BritEng usages.