Yes, upon is in the scrabble dictionary

...and is worth 9 points by itself.

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Upon Definition

preposition

On. See Usage Note at on.
from The American Heritage Dictionary of the English Language, 4th Edition

adverb

On the surface on it.
from Free Scrabble Dictionary

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Top Words by points

Points

upon

6

2 letter words with UPON

Points

no

2

nu

2

on

2

op

4

po

4

un

2

up

4

3 letter words with UPON

Points

pun

5

upo

5

4 letter words with UPON

Points

upon

6

Found 10 words in 0.10963 seconds