COMMUTER ACFT TOLD TO ABORT TKOF BECAUSE ACR TAXIING BEHIND SIGHTS SNOW BUILDUP ON ELEVATORS.

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WE ARRIVED AT LGA TO FIND OUR ACFT COVERED WITH ABOUT 2 INCHES OF SNOW. WE REQUESTED DEICING AND IT WAS DONE AFTER BOARDING. WE NOTED THAT THE DEICING TIME TOOK OVER 20 MINS TO COMPLETE. WE WERE GIVEN DEICE TIMES BY OUR MAJOR PARTNER (ACR X) AND THEY HAD USED BOTH TYPE I AND TYPE II FLUIDS. BEING CONSERVATIVE WE USED THE TYPE I HOLDOVER CHART WHICH GAVE US A TIME OF 5-15 MINS. THE WX AT THE TIME OF DEICE WAS LIGHT SNOW FLURRIES. WE TAXIED OUT AT XA15 AND IT TOOK ONLY 5 MINS TO REACH RWY 31 FOR DEP. WE DID OUR REQUIRED PRETKOF CONTAMINATION CHK AND THE FO AND I BOTH AGREED THAT THE WINGS WERE CLEAN. ON THE TKOF ROLL THE TWR CALLED US TO ABORT THE TKOF AND ADVISED US THAT ACR Y HAD RPTED SNOW ON THE AILERONS. ACR Y CORRECTED THE TWR AND SAID IT WAS ON THE HORIZ STABILIZER. WE CLRED THE RWY AND RETURNED TO THE GATE. UPON ARR AT THE GATE THE DEICE CREW QUICKLY SPRAYED THE HORIZ STABILIZER AND FUSELAGE AGAIN BEFORE WE COULD GET OUT TO INSPECT IT. I DID A WALK AROUND THE ACFT AND INSPECTED THE SURFACES I COULD SEE. THE PROC IN OUR DEICE MANUAL REQUIRES A FINAL INSPECTION BY THE DEICE CREW WHICH IS TO ENSURE THE TAIL HAS BEEN PROPERLY DEICED. THE HORIZ STABILIZER IS TOO HIGH FOR US AS A FLC TO DETERMINE IF IT HAS BEEN PROPERLY DEICED; SO WE ARE ONLY REQUIRED TO LOOK AT THE WINGS FROM INSIDE THE ACFT. I BELIEVE THE ACR Y CREW SAVED THE LIVES OF MY PAX; MY CREW; AND MYSELF. WE PROBABLY WOULD HAVE HAD A TAILPLANE STALL WITH DISASTROUS RESULTS. SUPPLEMENTAL INFO FROM ACN 322191: THIS TYPE ACFT HAS A VERY HIGH TAIL AND IT IS IMPOSSIBLE TO SEE THE TOP OF IT FROM THE GND. AS A CREW WE HAVE TO TRUST THAT THE DEICE PERSONNEL DID THEIR JOB; PARTICULARLY WHEN THEY TELL US THAT IT WAS COMPLETE. THIS PARTICULAR STATION IS WELL KNOWN FOR NOT LIKING TO WORK ON TURBOPROPS; AND WE NEVER GET GOOD SVC FROM THEM. ME AND THE CAPT AGREED THAT THE PLT BEHIND US WAS MOST LIKELY CORRECT; AND THAT WE HAD ICE ON OUR ELEVATOR. WE ALSO AGREED THAT THERE WAS NOTHING WE COULD HAVE DONE TO PREVENT THIS POTENTIALLY DANGEROUS SIT. WE DID RPT THE PROB TO OUR SAFETY COMMITTEE.