ARTCC CLRED A C4O4 FOR AN ILS RWY 28 APCH TO TVC AND FORGOT TO CHANGE THE ACFT TO TWR FREQ. THERE WERE SNOW PLOWS STILL ON THE RWY AND THE C404 LANDED BTWN THE PLOWS WITH APPROX 2000 FT SEPARATION AND WITHOUT A CLRNC FROM THE TWR. ARTCC RADAR CTLR CHANGE HAD TAKEN PLACE AND AN UPDATED POS RPT ON THE C404 HAD NOT BEEN GIVEN TO THE TWR NOR WAS THE C404 TOLD TO CONTACT THE TWR FOR LNDG CLRNC BY THE NEW ARTCC RADAR CTLR.

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PLT; AFTER BEING CLRED FOR ILS APCH AT TVC; WAS NOT SWITCHED TO TWR FREQ BY ZMP. PLT NEVER CONTACTED TWR AND LANDED RWY 28 WITHOUT ANY LNDG CLRNC. THERE WAS SNOW REMOVAL EQUIP ON THE RWY AT THE TIME. ACFT LANDED BTWN 2 PLOWS. NEAREST PLOW WAS APPROX 2000 FT FROM ACFT. SUPPLEMENTAL INFO FROM ACN 361121: ATX C404 INBOUND TO TVC FROM SE FOR ILS. TVC CALLS AND ADVISES ZMP BRAN. ASKS HOW FAR OUT THE C404 IS. ZMP ADVISES TVC THAT THE C404 IS APPROX 6-7 MINS OUT AND 10 MI FROM GWENN (OM). TVC TWR TOLD ZMP TO HOLD THE C404 WHILE THEY 'BLADED' THE RWY. C404 WAS THEN ADVISED OF THE SIT AND CLRED INTO THE HOLD AT GWENN AT 3000 FT. THIS ALL OCCURRED PRIOR TO MY TAKING OVER THE SECTOR; BUT I WAS PLUGGED IN; READY FOR THE RELIEF BRIEFING AND WAS AWARE OF THE SIT. XA35Z; I GAVE C404 REVISED EFC AND CALLED TWR FOR AN UPDATED TIME SINCE THE '10-15 MINS' THEY HAD ADVISED US IT WOULD TAKE TO PLOW THE RWY HAD ALREADY LAPSED. THEY ADVISED ME (ZMP) THAT IT WOULD BE 2-3 MINS MORE. XA37Z; TVC TWR CALLED ZMP AND ADVISED 'PLOWED 120 FT WIDE WITH THIN SLUSH ON RWY -- BRAP; BRING 'EM IN.' XA38Z; ZMP CLRED C404 FOR ILS RWY 28 APCH AT TVC. I DID NOT ISSUE A NEW POS RPT TO THE TWR SINCE THEY WERE THE ONES WHO INITIATED THE HOLD IN THE FIRST PLACE. ALSO; AUTOMATION SHOULD GIVE THEM UPDATED TIMES. I INADVERTENTLY OMITTED A FREQ CHANGE TO TVC TWR. XA40Z; TVC TWR CALLS ZMP (NEW CTLR ON POS AT ZMP). TVC ASKS ZMP WHO THE ACFT WAS THAT LANDED WITHOUT A CLRNC. TVC CTLR WAS NOT HAPPY! THE ZMP CTLR ADVISES HE FIGURES IT IS C404 BUT HE'S NOT SURE. TVC SAYS ACFT LANDED WITH PLOWS ON THE RWY. WHAT CAUSED PROB: I FEEL 1) ACFT LNDG WITHOUT CLRNC TO LAND. HE ONLY HAD APCH CLRNC. 2) TWR TOLD US TO 'BRING 'EM IN' WHEN THEY STILL HAD PLOWS ON THE RWY. I FEEL STRONGLY THAT NO NEW POS RPT HAD NO FACTOR SINCE THEY KNEW THE ACFT WAS IN THE HOLD AT GWENN OM AND HAD HAD A PRIOR POS RPT. CONTRIBUTING FACTOR: I NEVER SWITCHED ACFT TO TWR FREQ. HOWEVER; IF HE HADN'T LANDED WITHOUT A CLRNC AND RATHER EXECUTED A MISSED APCH; NO ERROR WOULD HAVE OCCURRED.