Probably because they're not coconut palms. There are many species of trees (over 1500) generically called "palm trees," but only the coconut palm produces coconuts. The scientific name of the coconut palm is Cocos nucifera, which is essentially the Latin equivalent of "coconut bearer."
Even if they are actually coconut palms, they might not bear coconuts in Arizona. Coconut palms require very warm temperatures year-round, and considerable moisture; Arizona is a bit too far north, and mostly too dry, for them to grow well.
All palm trees are vascular plants. Some palm trees bear fruit such as the coconut palm tree and the date palm tree.
coconut king coconut Kitul
Coconut trees are a type of palm tree, and they can grow quite tall, typically reaching heights of 50 to 80 feet (15 to 24 meters). Other palm species can vary significantly in height, with some being shorter than coconut trees. Overall, many coconut trees are among the tallest of the palm family.
Coconut
No
Coconuts come from the coconut palm.
Some palm trees produce coconuts, which are the fruit of the coconut palm (Cocos nucifera). Additionally, other palm species produce dates, such as the date palm (Phoenix dactylifera). Palm trees can also yield oil, such as palm oil from the oil palm (Elaeis guineensis), and some varieties produce edible seeds or nuts.
Coconuts, and palm leaves for housing materials.
All palm trees bare fruit. The most common fruit is the coconut.
In A Way Yes, One Because There Both Palm Trees, And No Because Coconuts Make The Tree Different.
Coconut
coconut and bananas