is it true that some coffee types contain elephants dung? As you can see in this post of the Telegraph


  In the lush hills of northern Thailand, a herd of 20 elephants is
  excreting some of the world's most expensive coffee. Trumpeted as
  earthy in flavour and smooth on the palate, the exotic new brew is
  made from beans eaten by Thai elephants and plucked a day later from
  their dung. A gut reaction inside the elephant creates what its
  founder calls the coffee's unique taste.


Is this in fact real?
This is actually called black ivory coffee.

Cambodia is not actually where you get this coffee originally. The company that creates this coffee is actually based in Thailand and uses coffee beans and elephants in Thailand to make this weird sounding coffee. As said by Wikipedia:


  Black Ivory Coffee is a brand of coffee produced by the Black Ivory Coffee Company Ltd in northern Thailand from Arabica coffee beans consumed by elephants and collected from their waste 


A simple Google search brings up a lot of results on black ivory coffee where your Telegraph article comes up as the first result. Thus, this does exist and is not a hoax.