They tickle the turkey to make sound "Google, google and google - that how also Google got the idea to make
it the search engine, nowadays.

Here is what Google or Gobble said -

"Gobble. The gobble is a loud, rapid gurgling sound made by male turkeys. The gobble is one of the principal
vocalizations of the male wild turkey and is used primarily in the spring to let hens know he is in the area".