Alfred Griffin workhouse

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Does anybody know would they have been made to be baptised by the church/ workhouse seeing as they were older and hadn't already been baptised?

Baptism wouldn’t be compulsory, but if there was doubt about whether they had been baptised earlier it would probably have been encouraged.

probably to prove that this was their parish if they were requiring relief from the Board of Guardians

There were no Boards of Guardians in 1830. Baptism in a parish did not create eligibility for relief. As children, their place of legal settlement would have depended on their father’s, unless they were illegitimate and/or he was unknown – which doesn’t seem to be the case here.