Twisted Poppy, Cosmo, Astro, and Sprout too, but not in the same exact sense.
Poppy and Cosmo have frowns, Poppy's seeming more like one of anguish however
Sprout, despite having no visible mouth, has his eyes seemingly show that he's in pain and feeling a lot of guilt
And Astro is basically the same case as Sprout, minus the missing mouth part.
To put it simply
It all has to deal with the eyes and mouth expressions that determine their alignment