Turks will always be Mongoloid

The Arab Muslim Umayyads and Abbasids fought against the pagan Turks in the Muslim conquest of Transoxiana. The Muslims built ribats (military fortifications) against the non-Muslim Turks in Transoxiana.
The Medieval Arabs recorded that Medieval Turks looked strange from their perspective and were extremely physically different from the Arabs, calling them "broad faced people with small eyes".^[127][128]
Medieval Muslim writers noted that Tibetans and Turks resembled each other and often were not able to tell the difference between Turks and Tibetans.^[129]

The Hadith collection Sahih al-Bukhari records a Sahih Hadith by Muhammad on the Turks- Narrated Abu Huraira: Allah's Messenger (ﷺ) said, "The Hour will not be established until you fight with the Turks; people with small eyes, red faces, and flat noses. Their faces will look like shields coated with leather. The Hour will not be established till you fight with people whose shoes are made of hair." (حَدَّثَنَا سَعِيدُ بْنُ مُحَمَّدٍ، حَدَّثَنَا يَعْقُوبُ، حَدَّثَنَا أَبِي، عَنْ صَالِحٍ، عَنِ الأَعْرَجِ، قَالَ قَالَ أَبُو هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ تَقُومُ السَّاعَةُ حَتَّى تُقَاتِلُوا التُّرْكَ صِغَارَ الأَعْيُنِ، حُمْرَ الْوُجُوهِ، ذُلْفَ الأُنُوفِ، كَأَنَّ وُجُوهَهُمُ الْمَجَانُّ الْمُطَرَّقَةُ، وَلاَ تَقُومُ السَّاعَةُ حَتَّى تُقَاتِلُوا قَوْمًا نِعَالُهُمُ الشَّعَرُ ".)

Turks in European accounts

The Turkomans observe a difference between their children from Turkoman mothers, and those from the Persian female captives whom they take as wives, and the Kazakh women whom they purchase from the Uzbeks of Khiva. The Turkomans of pure race enjoy full privileges, while the others are not allowed to contract marriages with Turkoman women of pure blood, but must choose themselves wives among the half-castes and Kazakh captives.
As there exists a great animosity between the Yamuds and Goklans they do not intermarry, although they reckon themselves of equally noble lineage. The same hatred is extended to the Tekke Turkomans, whom the Goklans and Yamuds, moreover, look upon as their inferiors, being, according to their genealogies, the descendants of a slave-woman, whilst they are the posterity of a free-woman. (p. 71)
The more intimate connection of the Astrakhan and Kazan Tartars with the Mogols can be traced in their features; with the Nogay it is less visible. In like manner, the Turkomans further off in the desert, and the Uzbeks of Khive, have more of the Mogol expression than the Turkomans who encamp near the Persian frontier. The frequent intercourse of the Nogay, in latter years, with the Cherkess, seems to have improved their race; and notwithstanding the enmity that exists between the Turkomans and the Persians, it is still not unlikely that their close vicinity should have produced on the former a similar effect in a lapse of several centuries. The fact we have seen, that the Turkomans marry Persian women, when they take them as prisoners. The Turkoman women are, like the men, tall, and when young, well-shaped; their faces are rounder than those of the men; the cheek-bones less prominent; the eyes black, with fine eye-brows, and many with fair complexion; the nose is rather flat; the mouth small, with a row of regular white teeth. In a word, a great number of the younger part of the community might be reckoned as fair specimens of pretty women.