VMware Fusion can import Parallels Desktop virtual machines (*.pvm) and can be use them for making their own VMDK ones.
Convert Parallels Desktop virtual machine to VMware virtual disk.
We found one software available in the database for this conversion.
Apple macOS / Mac OS X software - convert pvm to vmdk on OS X
Program used for migration of Windows PC to Mac
Convert from pvm file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.