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Good list of variations on that wiki page and then you read further and the list of ways Americans have responded by kidnapping, shooting and killing kids by chasing them down in a car and driving them off the road! Americans do really appear to struggle to take a joke…
Saying that its so bloody British that we have made a specific law for it
“ the Town Police Clauses Act 1847, it is a criminal offence to "wilfully and wantonly disturb any inhabitant, by pulling or ringing any door bell, or knocking at any door" punishable with up to 14 days' imprisonment.”
In the Midlands (Coventry) it was 'Rat-tat-ginger' when I was growing up - https://www.coventrytelegraph.net/news/local-news/national-dialect-day-coventry-words-6523710
Some etymology and other options here https://en.wikipedia.org/wiki/Knock,_knock,_ginger
'Ping pong dash' in Japan apparently!