Pippin.
There hasn't been one with three letters beginning in u and ending in n.
Treen!
Nim
Anden, Allen, Alden, Anton, Avery...
keenkinkingpin
tantakententensiontendonteenthinthenthantintontalontokentoboggantreasontractiontrainteaspoontablespoontoxintaverntakentoughen
Cyan and Crimson.
movie stars whose last name starts with C and ends with N: * James Caan * Michael Cain
There are no countries that both begin and end with the letter N.
Neither.
nyala
The word you are looking for is "cayman". Caymans are crocodilian reptiles that have a long, skinny snout.