Yeah Jungletac (KUMM) does a lot of clones (One of these days I'll make these folder names actually intelligible...) They're very close to the original Famicom games but they aren't based on the original code. Notice also that Lonely Island is a near-perfect clone of "Hirake Ponkikki", and Push the Ball is "Shufflepuck Cafe".
As for the Track & Field games, I can't find concrete proof whether they're hacks or clones; I thought they were hacks, but looking at all the random, non-T&F games running on the same engine, I'm starting to think they are the latter...
Also forgot to comment on the 210-in-1. Weird to see a VT03 Inventor game (Luck Ball). There must be others out there somewhere, I doubt they'd just end up making one.