I would like to know if I don’t have turba with me and I am praying with sunni brothers, what can I put on the carpet instead? And if I don’t have nothing and I pray with my head in the carpet, is the salah accepted ?

You must make sajdah on any natural substance which grows from the ground as long as it is not eaten or worn, so any clay, mud, dust, leaf, grass, paper, wood, stone etc is sufficient.

If you can’t find any of the above then you must repeat the prayer if you made sajdah on the carpet.