Samuel and Mary Hall had several other children baptised at Crediton.
Elizabeth baptised 6.12.1730.
It looks as if she was buried 1.8.1734.
Unfortunately the vicar of Crediton gives very little information in these registers. No ages given, or even if the burials were children, or their parents' names.
But this Elizabeth must have died, as another Elizabeth was baptised to Samuel and Mary 15.6.1735.
Joshua was baptised to them 28.8.1737. It looks as if he was buried 25.3.1740. (There is also an entry for a Joshua for 1770 but this is a mis-trancription of the date).
Rebeckah was baptised 9.3.1739, buried 25.4.1742.
(There is also a 'Robert' indexed for the same date - 9.3.1739, but if you look at the original entry, this is a mis-transcription of Rebeckah. So no twin brother for Rebeckah).
Mary was baptised 4.9.1745, and looks as if she was buried 18.2.1745. (February 1742 would come after September 1742 at this point in time, the new year starting in April).
There are quite a lot of 'Lake' baptisms and burials in the Crediton registers, so some of these names may lead you further back.
They didn't have much luck did they will their children?
You're lucky their son Samuel made it to adulthood.
However, it does you give you some names which you might be able to relate back to the previous generation, either for Samuel's parents, or Mary Halls'.
Several of these names are interesting.
Samuel, Joshua and Rebeckah are quite unusual biblical names, and it sounds as if there may have been some non-conformist association.