You sure can use vmkfstools command for doing this manually. It does this per datastore though and not host.
So if you have a vm with one vmdk on datastore1 and you want a clone of it either on same or different datastore, you can do a
vmkfstools -i path/vmdk newpath/vmdk
Trouble is this only clones the disk and that too one disk at a time. But you can either copy the vmx or create a new vmx and power on the VM
Do remember to mark my post as "helpful" or "correct" if I've helped resolve or answer your query!
