The title of this question is Google suggestion verbatim, when I tried to write it. Yet, I found no answer specifically for Turkish hazelnuts.
Turkish hazelnut is a tree and it's fruit looks different from normal hazelnuts growing on hazelnut shrubs.
One such tree is planted close to my house, so I was wondering if I could eat all the nuts on the ground.
First off all let me say something about this tree.
Turkish hazelnut (Corylus colurna) is a slow growing pyramidal tree approximately around 25 m (82ft) tall, with a stout trunk up to 1.5 m (4 ft 11 in) in diameter. Leaves are deciduous, rounded, 6-15 cm long and 5-13 cm across, softly hairy on both surfaces. Corylus colurna is actually the largest species of hazel. The name Korylos (korys) comes from Greek and means helmet. The tree is dioecious.
Nuts are about 1-2 cm long, surrounded by a thick, softly spiny and bristly involucre (husk) 3cm diameter. The nuts are born in cluster of 3-8 together. The nuts mature in September and are edible, with a taste similar to common hazel (Corylus avellana). The nuts have a very hard shell, approximately 3 mm thick, which it makes them a little hard to open. Nut production is very irregular and occurs every two to three years.
Source
https://en.wikipedia.org/wiki/Corylus_colurna http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=277856 https://www.chicagobotanic.org/plantinfo/tree_alternatives/turkish_hazelnut
