There is a reason we call it tuna fish! Way back when they first started canning it back in the olden days, they wanted to discern it from tuna (the fruit of the cactus). It just kind of stuck (this is a cactus joke. You should laugh).
(Edit, I typed distracted, mistakes were made, now there fewer)
The tuna is the fruit of the prickly pear cactus (Opuntia). The fruits are called tunas. The pad is edible as well, when that is eaten it is called nopales.
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u/blahnlahblah0213 9h ago
The one that I find funny is that we say tuna fish sandwich, or a can of tuna fish. Like, is there something else besides fish that is tuna?