даҳҳо: tens, dozens
In Dushanbe there are dozens of theatres, museums and libraries.
Дар натиҷаи тарма даҳҳо роҳи хурду бузург баста шуданд.
As a result of the avalanche dozens of small and large roads were blocked.
It sounds a bit strange in English to say “tens of” in these sentences, although that is what this word means. There is no Tajik word for “dozens”.
даҳҳо ҳазор: tens of thousands
даҳҳо миллион: tens of millions
In those examples, the words ҳазор and миллион are not pluralized.