Use the below code for fetching values. It will give you field_naam_value
field data.
$naam = db_select('profile', 'pf');
$naam->join('field_data_field_naam', 'fd', 'pf.pid = fd.entity_id');
$all_names=$naam$all_names = $naam->fields('fd', array('field_naam_value')['field_naam_value'])
->condition('pf.uid', 4, '=')
->execute()
->fetchAll();
foreach ($all_names as $record)
{
die;
}