yeah, there probably is an NT version, or something like that.
I wouldnt go so far as to say Hummer Team was working with ABAB Soft though.. everything discovered on one of their carts so far is either something already released on a single cart, or a hack, or something fairly amateurish (by hummer/etc standards) like Panda Adventure. My guess would be that maybe one member of staff joined ABAB (taking the sound engine and whatever games they had access to), and it was someone from whichever offshoot developed all those games for NT.
edit: though I think that 15 in 1 will probably hold a few answers. they seem to show up quite often on ruten. if only I had some damn money.