I emailed John Passfield who was one of the Amazon Queen developers:
Yes, the Amiga version was originally written in AMOS then converted over to C code, in fact the source code in C has a lot of emulated AMOS function calls.
The PC version was also converted across using the same C code base.
The tools to build the game were also written in AMOS and the entire game editing was done on the Amiga computer.
The game engine was called JASPAR - for "John And Steve's Programmable Adventure Resource"
The tools were:
JOKER - the game edtor. This allowed the building of rooms, laying out of objects and actors and walk paths, etc.
ACE - the cut scene editor.
DOG - the conversation tree editor.
I wrote the engine and tools and Tony Ball converted the JASPAR engine to the PC.