What is this hole in my porch called?

Provided it is open at the bottom and top, it's a combination 'access to the crawl space' and 'porch drainage'.

I have done a number of searches based on 'Craftsman porch design', and I cannot find a special name for it.

It appears to be a classic field stone arch. Most of these homes have a latticed skirting covering the access to the crawlspace. They provide ventilation to the underparts of the porch, which unless airy, can become a dark and dank snake and rodent haven. When dry, our canine companions find it a cool place to take a snooze, especially during the dog days of summer*.

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*I seem to recall a Michael J Fox movie filmed in Georgia, and a sweat-gland-less family that sleep beneath their porch during the hot nights.

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Update:

Phil Sweet has suggested 'scupper', and I thought that was only nautical, however,

an outlet in the side of a building for draining water.

Lexico

Given the position of the outlets, they appear to be drains; in other words 'scuppers'.

Scuppers would be the best suggestion.