Yes, frith is in the scrabble dictionary

...and is worth 10 points by itself.

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Frith Definition

noun

Scots A firth.

from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points	Points
firth	11

2 letter words with FRITH	Points
hi	5
if	5
it	2
ti	2

3 letter words with FRITH	Points
fir	6
fit	6
hit	6
rif	6

4 letter words with FRITH	Points
frit	7
rift	7
thir	7

5 letter words with FRITH	Points
firth	11
frith	11

Found 13 words in 0.13186 seconds