The Game of Doublets--Reboot f

males

sales

Scales

stales

States

state

skate

Skat

slat

slant

Slank

swank

Swanky

Twanky

Twank

Thank

Shank

“twank” is not in the Official Scrabble Dictionary
(note the link is missing from the intro post: https://scrabble.hasbro.com/en-us/tools#dictionary)

Last valid play is “twanky”.

Twangy

tangy