Locke discovered that there was no "a priori" knowledge. Philosophers have explained Locke by using this concept/question. You wouldn't be able to explain a pineapple to an Eskimo if you didn't have one handy, because he/she wouldn't understand the concept of a tropical fruit (...in Locke's time, because nowadays, we have access to internet, newspapers, drawings, etc..., and most likely people in the antarctic have seeing a pineapple and know about it...)
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Yes, shapes and colors are external stimuli, but concept of 'tropical fruit'? Remember, you've got no pineapple with you - nothing! You could be right! In Locke - even Hume's time, people knew little in contrast to our day.
Today "yes," but when Locke lived, not likely... Locke lived in a time when travel was very limited... Furthermore, Eskimos probably stayed close to their place of birth, so they may not have been exposed to the things you're speaking of.