Frostbound is valid Scrabble Word

Is frostbound a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is frostbound valid Words with Friends?
Words with Friends NO

Definitions for FROSTBOUND in dictionary:

How to use FROSTBOUND in a sentence

Find what other words can be done using letters: "frostbound"
https://scrabble-word.com/finder/frostbound
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