Yes, tam is in the scrabble dictionary

...and is worth 6 points by itself.

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Tam Definition

residual

Television audience measurement.
from Free Scrabble Dictionary

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Top Words by points

Points

mat

5

2 letter words with TAM

Points

am

4

at

2

ma

4

ta

2

3 letter words with TAM

Points

mat

5

tam

5

Found 6 words in 0.13722 seconds