The kana よ on the map looks full size to me, though I would expect ょ. Is there any other data? I took a look on various map apps in the vicinity of 砺波市庄川町名け原, but couldn't find any finer resolution names that matched this.

It is common for small kana to be rendered as regular kana in some contexts. Also, the small ケ in the same evidence image is also rendered as a regular kana, which is another clue.

Due to Japanese legislative niceties, names officially registered until 1980s might have big kana while small kana is expected.