SQUATTEST is a playable word

squat Scrabble® Dictionary

adjective
squatter, squattest
short and thick
(adverb) squatly
verb
squatted, squatting, squats
to bend one's knees and sit on one's heels
111 Playable Words can be made from "SQUATTEST"
   2-Letter Words (9 found)
   3-Letter Words (31 found)
   7-Letter Words (4 found)
   8-Letter Words (1 found)
   9-Letter Words (1 found)