Icicles.
I don't believe there is a 3 letter word for fear in English. The closest would be 'awe' and that is not exactly the same meaning.
Phobophobia
The root meaning of claustrophobia comes from the Latin word "claustrum" meaning enclosure or confined space, and the Greek word "phobos" meaning fear. Combined, it refers to the fear of enclosed spaces.
the original meaning is a frozen dog
The Tagalog word for "fear" is "takot."
The direness of the situation had him frozen in his place in fear
hail
There is no such word in English.
Fear is the root word.
hoar
it means frozen