NMAC BTWN 2 PA28'S; 1 ARR FRG; 1 DEP FRG; AT 2900 FT 1 NM W OF THE VOR AT DPK.

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I WAS LNDG AT FRG. I CALLED FRG TWR AT NORTHPORT STACKS AND WAS TOLD TO RPT 1 MI N OF DPK VOR. AT 1.5 MI N OF DPK; TWR CALLED ME AND INSTRUCTED ME TO TURN W AFTER XING LONG ISLAND EXPRESS AND FOLLOW A CESSNA IN. UPON TURNING W I SAW A CESSNA AHEAD AND BELOW MY POS AND INFORMED FRG TWR THAT I HAD TFC. I THEN SAW A LOW WING ACFT HDG E AT MY 11 O'CLOCK POS ABOUT 200-300 FT. I EXECUTED A DSNDING R TURN AND THE OTHER ACFT PASSED BY LESS THAN 200 FT. I DON'T BELIEVE THE OTHER PLT EVER SAW ME. I WAS ABOUT 7 NM FOR THE ENTRY TO THE FRG TFC PATTERN RWY 32 WHEN THIS OCCURRED. I INFORMED THE CTLR OF THE NMAC AND HIS REPLY WAS THAT I RPTED HAVING TFC. I THEN REPLIED THAT MY TFC WAS A HIGH WING CESSNA AND NOT A LOW WING ACFT. HIS REPLY WAS THAT THE CESSNA WAS AHEAD AND 600 FT BELOW ME AND THAT I WAS OUTSIDE CLASS D AIRSPACE. THE CTLR ALSO STATED THAT HE HAD INSTRUCTED ME TO DSND TO PATTERN ALT (WHICH IF HE HAD I DIDN'T HEAR) WHICH WOULD NOT BE THE NORM SO FAR FROM THE ARPT. THE CTLR DID ASK MY ALT TWICE BEFORE THIS HAPPENED AND I RESPONDED 3000 FT AND LATER 2900 FT. THE CTLR THEN STATED THAT HE DIDN'T HAVE CTL OVER ACFT DEPARTING FRG. RWY 32 WAS IN USE AT THE TIME. THE STANDARD DEP FOR RWY 32 AT FRG IS TO NOT TURN E UNTIL N OF THE LONG ISLAND EXPRESSWAY. BOTH ACFT WERE S OF THE LONG ISLAND EXPRESSWAY WHEN THIS OCCURRED. HAD THE OTHER ACFT BEEN N OF THE LONG ISLAND EXPRESSWAY BEFORE TURNING E; THIS WOULD NOT HAVE OCCURRED. HAD THE CTLR CALLED OUT THE OTHER ACFT; THIS WOULD NOT HAVE OCCURRED. THERE WERE 2 OTHER PLTS IN MY ACFT WHEN THIS TOOK PLACE.