Pineapple palms typically refer to Phoenix canariensis and (typically) have a thick trimmed trunk with the overall appearance of a large pineapple.
The Date fruit come from the Phoenix Dactylifera. There are a number of varieties with the fruit of the Medjool variety being the most desirable and the Deglet Noor variety is very common.These are commonly used as "street trees" and may be seen throughout the Las Vegas Strip. When used as an ornamental tree, the tree is 'skinned' with a chain saw and a 'diamond' cut is accomplished.
Phoenix roebelenii is another "date" palm, commonly referred to as a Pigmy Date Palm.