Air Taxi pilot reported while entering the pattern with ATC encountering two aircraft resulting in Near Midair Collisions with no advisories from the ATC Tower.

Narrative

At 7nm to the NE of King Salmon Airport Aircraft X (the aircraft I was the PIC of) called in for clearance to enter the King Salmon Class D surface area in day VFR conditions via an east cross of the airport for landing on the river. Clearance was approved to enter the airspace and instruction was given to fly via the east cross for a landing on the waterway just a couple of hundred feet south of the runway. During this time no traffic information was given.Inside the Class D boundary at approximately 4nm to run I received a radio call from another aircraft letting me know that he spotted me and was about to pass right over the top of me. I spotted the aircraft just a couple of seconds before he passed over the top of me within 100-200ft from south to north.At no point did ATC notify either of us of the other person or their position. After that call was made between the two aircraft; ATC called me and told me 'Aircraft X traffic inbound (roughly) 2nm east for the river'I then looked outside and spotted the traffic that they had mentioned that was 2nm to the east of the field landing on the river. I reported back 'Aircraft X has the traffic about to land in sight and the aircraft that just passed me. Notifying ATC of the aircraft that I had almost had a midair collision with.30 seconds later with no mention at all from ATC; Aircraft Z; another aircraft passed directly underneath me within 100-200ft from south to north. Not only did ATC fail to notify me of two aircraft that were seriously close to being a midair collision; they also distracted my attention towards an aircraft that was approximately 3-4nm away and was no factor to the safety of the flight. This isn't the first time ATC at King Salmon has failed to mention traffic that is an immediate potential conflict; and instead will just mention another aircraft generally in the airspace that isn't a factor to the safety of the flight. It happens quite a lot but this is the closest I have gotten to a midair collision due to ATC at King Salmon; and twice in a row. Once I was on the water I requested the registration of the first aircraft from ATC over the radio. The response was 'I must have accidentally erased it' This lack of situational awareness and dismissive behavior is unacceptable in a professional environment where safety is the priority.