Here are all the possible troll sprite combinations:
Feferi+Sollux
Sollux+Nepeta
Gamzee+Sollux
Sollux+Equis
Sollux+Eridan
Eridan+Equius
Feferi+Eridan
Eridan+Gamzee
Nepeta+Eridan
Nepeta+Gamzee
Equis+Nepeta
Nepeta+Feferi
Equis+Gamzee
Feferi+Equis
Feferi+Gamzee
I believe these are all the possible combinations.
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I bring order and chaos, I am life and death, creator and destroyer, just like the rest of humanity.
My bunnyslug: http://img.imgcake.com/nio/catapngzu.png