Botanically, fruit is a part of a flowering plant which contains its seeds.

Acai berries (fruit of the acai palm - the freeze-dried powder is about 30% fat.

Oil palm fruit is also high in fat; "palm oil" is derived from the fruit. "Palm kernel" oil comes from the seed of the fruit.

Coconut - is technically a drupe, but the mesocarp/flesh is fibrous & dry, and high in fat rather than water (like that in a drupe such as a peach) Walnuts also belong to this category.

True nuts are botanically fruit (they are basically the composite of a seed & fruit - two in one) - that includes filberts/hazelnuts, brazil nuts

Peanuts can also be considered a simple dried fruit high in fat, since they are the end form of the legume fruit (concealed inside a pod/'geocarp')

The carrot plant also produces a 'fruit' - which is a 'schizocarp', a dry fruit developing into multiple carpels (ovules) - so the carrot seed is essentially a fruit.

Almonds & pecans by themselves are not fruit, but the seeds of a fruit (drupe), similarly to cashews (seed of the cashew apple), the fruit itself in this case isnt high fat. Cocoa nibs are also seeds of a fruit.

Well, and the Durian, olives, avocado, that have already been mentioned.