If they are human they are Octuplets. If they are dogs they are a Litter.
1
If it is a group of calves born from different mothers than you call them a herd of calves or a group of calves. If it is two calves born at the same time from the same mother than they are twins, just the same as human offspring would be called.
quintuplets
1
twins
quadruplet
Septuplets
Impossible
Quintuplets.
Quintuplets
Hendeuplets