Image in the section “Amulets in the ears” erroneously shows not a Russian Cossack of Don but an Ukrainian Zaporizhian Cossack. If you click the link “Source” you will be eventually redirected to the Ukrainian site getmanat.org dedicated to Zaporizhian Cossacks.
It looks like that the only Cossacks which wore these Turkish-style forelocks (оселедець) were Zaporizhian ones. It was not typical for Cossacks of Don.
Zaporizhian Cossacks in the movie “Ogniem i mieczem”: