Another tennis game that supports 4-player adaptor: Super Tennis Champs. Superb game.
As for your list, Korodny:
Eat the Whistle - Planned but not implemented, afaik
Street Racer - Yes
Micro Machines 2 - n/a, as it never came out for the Amiga
The Freeware games I don't know about. Blast Squad is a Bomberman clone, so I would expect it would support 4 players.
Here is a thread about favourite multiplayer games, which has lots of references to 4-player games: http://eab.abime.net/showthread.php?s=&threadid=5308