Pranker is a man who is engaged in evil rallies, mockery and banter over naive citizens. Those who do this on the phone are called "telephone prankers".
The English word prank is translated as "a rally, an evil joke." Prankers use various divorce techniques, the most popular of which is the trick "I am from the FSB", when a naive victim is told in a severe voice that an important representative of the state is talking with her, although in fact it is some kind of pranker Vovan from the Krasnodar Territory who skillfully uses the human naivety.
Sometimes prankers manage to convince a celebrity that they call or write from the president's office. So it was, for example, with Nadezhda Savchenko, who received a "letter from Petro Poroshenko", which turned out to be pure water.
Pranker is in the list: Slang