What does tatelah mean in Hebrew?
Wow. First of all, it's not Hebrew, it's Yiddish.
It's the diminuitive slang form of the actual word ... "TAH-teh"
... which itself is a familiar,
informal term for 'father', borrowed from Russian, I think.
In Hebrew , 'father' would be "AHV" or "AH-bah". In proper
Yiddish, it would be "FAH-tare",
(straight from German).
One way to translate "TAH-teh-leh" might be something like
"little daddy".