чармгар: tanner
You can see more examples of гар as a suffix in this pdf: Expand your vocabulary – Suffixes
Resources for learning the Tajik language
You can see more examples of гар as a suffix in this pdf: Expand your vocabulary – Suffixes
Bonus:
Synonyms: кӯҳгард, кӯҳпаймо
кӯҳнавардӣ: mountaineering
навард: present tense stem of навардидан
навардидан: to wrap, to travel
Навард is used in compound words and has the meaning of “traveller”.
раҳнавард: hiker, walker
қайҳоннавард: astronaut
баҳрнавард: mariner, seafarer
Bonus:
There are two plural endings for nouns: ҳо and он. The ending он is only used for animate objects (people, animals etc.) with a few exceptions. The ending ҳо is the usual ending in casual speech. When a noun ends in a vowel the ending is гон instead of он, as in нависандагон.
The word набисанда is composed of the present tense verb stem, навис-, and the suffix анда. Here are a few more words formed in the same way.
хонанда: reader
нӯшанда: drinker
ронанда: driver
харанда: buyer
диҳанда: giver
парастанда: worshipper
чинанда: picker, one who picks
Он ки аз дар медарояд чӯпони гӯсфандон аст.
He who enters by the door is the shepherd of the sheep.
Дар доманаи кӯҳ чӯпоне рамаи гӯсфандонро мечаронд.
On the hillside a shepherd would graze his flock of sheep.
Bonus:
Another song to listen to: Чӯпони Нек Ҳастӣ.