Yes, riffed is in the scrabble dictionary

...and is worth 13 points by itself.

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Riffed Definition

verb

Simple past tense and past participle of riff.

from the English-language Wiktionary

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Here are some other words you could make with the letters RIFFED, you can also
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Top Words by points	Points
differ	13

2 letter words with RIFFED	Points
if	5
id	3
re	2
de	3
ed	3
ef	5
er	2
fe	5

3 letter words with RIFFED	Points
fir	6
fer	6
rif	6
rid	4
rei	3
ref	6
red	4
iff	9
ire	3
fie	6
fid	7
fed	7
eff	9
dif	7
die	4
def	7

4 letter words with RIFFED	Points
fire	7
reif	7
ride	5
rife	7
riff	10
ired	5
fife	10
fief	10
dire	5
diff	11
defi	8

5 letter words with RIFFED	Points
fried	9
fired	9
fifer	11
fifed	12

6 letter words with RIFFED	Points
differ	13
riffed	13

Found 41 words in 0.18986 seconds