Yes, you can change my document root folder on server using .htaccess file.
Add the following codes to the .htaccess file in the root folder:
RewriteEngine on
RewriteCond %{HTTP_HOST} ^domain-name.com$ [NC,OR]
RewriteCond %{HTTP_HOST} ^
www.domain-name.com$
RewriteCond %{REQUEST_URI} !folder/
RewriteRule (.*) /folder/$1 [L]
Hope this help you.