Yes. iMovie supports MOV (QuickTime) container format. However, iMovie only supports MOV files encoded with MPEG-4 and H.264 codecs only on earlier versions of macOS. iMovie on Mac with macOS Catalina or newer will support new codec in MOV file including ProRes and HEVC. If you can’t import MOV files to iMovie, it means your MOV files are encoded with codecs that iMovie can’t recognize.