In a research context, filling up many data collection forms by a single person without actual data collection or genuine input, will fall under :

Inventing entries by filling many data forms without any real fieldwork is fabrication, the making up of data or results.

Falsification differs because it manipulates or alters genuinely collected data rather than creating it from nothing.

Plagiarism concerns stealing another person's words or ideas, not inventing one's own data.

Conflict of interest involves competing personal or financial stakes that bias research, which is unrelated here.

Fabrication, falsification and plagiarism form the three cardinal categories of research misconduct.

The acronym FFP is the standard label for these three offences in research integrity codes.