SF350B FLT CREW RPTS ACFT DEICED IN ZZZ BEFORE THEIR DEP. UPON ARR IN ZZZ1 THEY WERE NOTIFIED BY OPS THAT THEY HAD DEPARTED WITH THEIR TAIL NOT DEICED.

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UPON ARR IN ZZZ1 WE WERE INFORMED THAT THE ACFT WAS NOT PROPERLY DEICED IN ZZZ. EVIDENTLY OUR TAIL WAS NOT DEICED BEFORE WE TOOK OFF FROM ZZZ. BOTH THE CAPT AND I OBSERVED THE GND CREW DEICE OUR RESPECTIVE WING THEN I OBSERVED THE TRUCK MOVE AROUND TO THE REAR OF THE ACFT. ONE OF THE GND CREW WAS STANDING BY THE LEADING EDGE OF MY WING AND I POINTED TO THE WING AND GAVE THE THUMBS UP SIGN; THIS RAMP AGENT RETURNED THE THUMBS UP AFTER POINTING TO MY WING. AFTER 4 TO 5 MINUTES HE WALKED AROUND TO THE FRONT OF THE ACFT. ONCE HE WAS IN FRONT OF THE ACFT; THE CAPT GAVE HIM THE SIGN FOR STARTING ENG 2. THE RAMP AGENT RESPONDED BY POINTING TO THE #2 ENG WITH ONE WAND AND CIRCLING THE OTHER ONE ABOVE HIS HEAD IN THE APPROVED START SIGNAL. I LOOKED OUT AT MY WING AND RESPONDED; 'CLEAR.' WE THEN HAD A NORMAL START. AFTER OUR 1 MINUTE THE CAPT GAVE THE SIGN TO START #1. THE RAMP AGENT RETURNED THE APPROPRIATE START SIGNAL TO US. THE CAPT LOOKED OUT AT HIS WING AND RESPONDED; 'CLEAR.' WE HAD A NORMAL START. AFTER THE CAPT GAVE HIM THE REMOVE CHOCKS SIGNAL; HE REMOVED THE CHOCKS AND WE PROCEEDED WITH THE AFTER START CHKLIST. UPON COMPLETING THAT WE CALLED FOR TAXI AND TAXIED OUT FOR DEP. ON THE TAXI OUT I CALLED OPS AND GAVE THEM THE OUT TIME AND REQUESTED THE DEICE NUMBERS. OPS GAVE ME THE FOLLOWING: DEICE STARTED AT 10 MINS PAST FINISHED AT 22 MINS PAST; TYPE 1; -34 DEGS. I READ THEM BACK AND ASKED IF THE POST CHK WAS COMPLETE. OPS RESPONDED WITH 'YEAH BEFORE THE ENG WAS STARTED.' I RESPONDED WITH; 'THANKS OUR OFF TIME WILL BE 25 MINS IF YOU DON'T HEAR BACK FROM US.' THIS WAS THE LAST TIME I TALKED TO THE STATION. WE HEARD NOTHING MORE FROM THE STATION. NOBODY REACHED US VIA COMMERCIAL RADIO WHILE ENRTE. SUPPLEMENTAL INFO FROM ACN 725170: UPON GETTING UP TO ZZZ1 WE GOT A MESSAGE TELLING US THAT THE ACFT TAIL WAS NOT DEICED. THE PEOPLE IN ZZZ APPARENTLY DID NOT DEICE THE TAIL YET THE PERSON IN ZZZ GAVE US THE SIGN TO START.