you can use "tuhaf "and "garip" interchangable. They are adjectives and they have the same meaning. But "garip" also means one more meaning. "garip" also means "homeless" , "pour" , or anybody who is in need of help desperately but noone to help him. And this time it is a noun. Sakar means "clumsy". Clumsy is a personality . In turkish it is almost the same meaning but sometimes you can act "sakar" if you are so much excited or afraid. you may do awkward things.Then people may call you "sakar".