What is the name of the type of art done at theme parks in which people are depicted funnily?

Whenever I got to disney world/seaworld i see that some of the staff will draw you for a fee. in these drawing they do it in colored pencil and crayon and they give people a big head and put little bodies on them. what is the name of this type of art? i want to find a website in which i can learn how to do this

caricature

Northeast Scarlet Winds – Art in the Park Mov. I-IV

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