As adjectives the difference between ploppier and gloppier
is that ploppier is comparative of ploppy while gloppier is comparative of gloppy.
ploppier
English
Adjective
(head)
(ploppy) ploppy
English
Adjective
(er)
Making a plopping sound.
(British, puerile) Relating to excrement. gloppier
English
Adjective
(head)
(gloppy) gloppy
English
Adjective
(er)
soft and soggy; mushy.