What is the friendly vocalization called when used by tigers?

some explanation of the picture would be nice,is it a mock up or are they really all together I know in the wild tigers are solitary but in captivity can be together some lygers in there too of some mix.

I learned this from the movie "We bought a zoo"

Kiwozzie, what noises do they make

We have a breeding line of white tigers in captivity in Queensland Australia. The offspring are either white or paler 'normal' tiger stripes as in the picture.