CLRNC CONFUSION; HVY TFC AND FREQ CONGESTION LEAD TO A RWY INCURSION AND GAR AT MSP; MN.

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WE WERE HOLDING AT TXWY D TO CROSS RWY 12R AT MSP AND TAXI DOWN THE OPPOSITE SIDE FOR TKOF ON RWY 12R. TXWY ON OUR SIDE CLOSED FOR CONSTRUCTION. AN ACR Y DC9 ROLLED BY FOR TKOF. AS HE PASSED I EXPECTED A CALL FROM GND TO CROSS. I WAS CAPT IN THE R SEAT ACTING AS FO. GND CALLED ONLY ABC X; NOT ACR Y ABC; AND SAID TO JOIN TXWY B AND (UNINTELLIGIBLE) AND FOLLOW THE ACR Z. I SAW THE ACR Z ON THE OTHER SIDE WHERE I WOULD HAVE EXPECTED HIM TO BE AND LOOKED AT THE CHART AND SAW TXWYS B AND A. I DIDN'T UNDERSTAND THE CTLR AFTER TXWY B BUT IT LOOKED REASONABLE. I CALLED 'CPR JET ABC -- ROGER.' THE FO STARTED ACROSS THE RWY AND SOMEONE SAID 'GND; YOU HAVE AN ACR Y ABC.' THEN I LOOKED AROUND THE FO AND SAW ACR Y ON A GAR. I SAID WE DIDN'T CLR THE RWY BEFORE XING. HE SAID I DID AND I DIDN'T SEE HIM AT FIRST BUT WHEN I DID I THOUGHT HE WAS FARTHER OUT AND FOR THE OTHER RWY. THIS INCIDENT COULD HAVE BEEN AVOIDED BY THE CTLR USING THE WHOLE CALL SIGN. I WILL SAY IN EVERYONE'S DEFENSE THE RADIO TFC WAS HORRENDOUSLY HVY; AS IT ALWAYS IS AT MSP.