Wiktionary
teasable
a. Able to be teased.
Usage examples of "teasable".
The children, finding out that Doshi was wonderfully teasable, enjoyed him immensely.
So children, even ordinarily good children, are ready to tease any child who simply looks teasable, and so provokes the act.
Mother was the most teasable person I ever knew, and my brother Andy could get her to laughing so hard at her own foibles that tears would run down her cheeks.