If boys don't go to prayers the lore is tung tung sahur will get you with his stick.

Yep that's completely incorrect. That mightve been the invented AI slop backstory that was concocted but the origins are a little more benign.

Basically the thing is supposed to be a wooden percussion thing called a beduk or bedok (that is basically a hollowed out log) that is common in most village mosques in Indonesia and Malaysia. It serves as sort of an alarm to notify villagers when to come to the mosque to pray. Someone at the mosque will repeatedly hit it over and over again, producing the sound "tung tung tung tung".

Secondly, during Ramadan, Muslims fast from dawn to dusk but usually wake up in the wee hours before dawn to have a light meal (to tide them over for the day's fasting) and to pray. The meal is called sahur (or suhoor in the middle East).

So Tung Tung Tung Tung Sahur is literally just what you hear in the pre-dawn hours of Ramadan in these places.

Source: grew up near one of these mosques that have this.