What animal or fossil that has been found has partially evolved fingers or toes?

None, that's not something you would expect because of the highly conserved hox genes. All animals had 4 limbs and 5 digits after ~300 million years ago, after the tetrapod bottleneck. Any animal that currently doesn't, lost them. Cats and dogs lost a back limb digit, and horses melded into 1.

https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.2017.1174

Here's a transitional fossil between digits and wings in dinosaurs that shows how birds lost 2 digits:
https://www.livescience.com/3704-fossil-solves-mystery-dinosaur-finger-evolution.html

Organisms do not evolve partial morphology - you have no idea how evolution works and how it does not.

Monkeys and apes, when compared to you.
Your precision grip is different.
You're better at knapping stone or crafting atlatl darts.

Humans.

Devonian semi-aquatic tetrapods had 5 to 8 digits.
Only the 5 digit amphibians survived the Late Devonian series of extinctions (385 to 360 million years ago).

Not sure 5 is better than other configurations. Maybe they just were lucky, or they survived thanks to other features and they independently happened to have 5 digits per fin/limb.
What's sure is that all more recent tetrapods found in the Carboniferous layers and later have 5 digits.

Next layers show gradual adaptation of the limbs to various functions: claws, wings, hooves, fins again, even atrophy and disappearance (snakes)

Ardi (ARA-VP-6/500) is the designation of the fossilized skeletal remains of an Ardipithecus ramidus, thought to be an early human-like female anthropoid 4.4 million years old. It is the most complete early hominid specimen, with most of the skull, teeth, pelvis, hands and feet, more complete than the previously known Australopithecus afarensis specimen called "Lucy." In all, 125 different pieces of fossilized bone were found. With regards to Ardi's body composition, archaeologists note that she is unique in that she possesses traits that are characteristic of both extinct primates and early hominids. It is still a point of debate whether Ardi was capable of bipedal movement. Ardi's divergent big toes are not characteristic of a biped. However, the found remains of her legs, feet, pelvis, and hands suggested that she walked upright when on the ground but was a quadruped when moving around trees. Her big toe, for example, spreads out quite a bit from her foot to better grasp tree limbs. Unlike chimpanzees, however, her foot contains a unique small bone inside a tendon which kept the big toe stronger. When seen along with Ardi's other bone structures, this unique bone would have helped her walk bipedally.