http://www.iranchamber.com/culture/articles/croatians_cra...
http://www.iranchamber.com/history/articles/identity_croa...

The Iranic or Irano-Aryan race as a whole is dolichocephalic (long-headed), leptorrhine (having long, narrow noses), tall, robust, dark-haired, large-boned and fair-skinned with straight hair. These features are found amongst the Jats, Pathans, Persians, Rajputs and Kurds. Due to the common features of Iranic skeletons with Nordics, some authorities consider the Nordics and Iranics as belonging to a common Nordic-Iranian macro-race. It is a further strong support for the Iranic origin of Croats that the Croats, and indeed, West Slavs in general, display strong Iranic racial features.

Thus, the majority of Croatians today tend to be tall statured, with narrow facial features. Many historians consider these western Slavic features to be a trait passed on from the Iranic tribes mentioned above. The Alans in particular are thought to have had considerable impact on the Croatian racial "type". Now, there are three sub-types of Croats proper: Dinaric (Iranoid race), Mediterranean (Latinoid race) and Panonian (Slavoid race) The Dinaric type to which many Croats belong is often viewed as an Iranic sub-type:

In the central mountainous regions settled by the Croats upon their arrival on the Adriatic the Dinaric type of Croat developed. This type is quite remote from the general Slavic type. The Dinaric Croats are tall in stature (ca. 1.8 metres), long-headed but with a skull of short circumference (cephalic index of 80-85)." (Mandic 1970, ch.3)

The main feature of the Dinaric sub-type of Iranics is that the head is long when viewed from front, but the circumference is short, giving the illusion of brachcephaly when viewed from the top. It is common amongst Armenians as well, and is often viewed as a breeding isolate of the Iranoid race. (less info)