The rhino officers are unnamed police officers in Sing.
The officers are all identical in appearance, each wearing blue police uniforms complete with hats and badges.
Other than being dedicated to their jobs, their personalities are not established in the film.
The officers first appear almost hearing Johnny singing and failing to stop Big Daddy's heist in the beginning of the film.
Later, however, they are successfully able to arrest Big Daddy and his gang when the latter attempt to rob a ship full of gold.
They are seen later again as guards in the prison when Big Daddy escapes to reconcile with Johnny.
“I thought I heard someone singing. Ah, whatever.”
–An officer when Johnny is singing behind an alley.
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||This link leads to the image gallery for Rhino officers. It can be viewed here.