I can see it going either way. Ice cream trucks are more recognizable in some English-speaking regions, but ultimately it's a single-digit number of posts.
Posted under Tags
Utility alias, as with such a low number of posts it probably doesn't need its own subtag.
Someone needs to move the food truck posts to ice cream truck where appropriate then, because as it was stated, the concepts are already merged and this alias would not move anything. Otherwise there's no point in keeping the two terms separate just because of a technicality that nobody has cared about in the last 15 years, if we're not going to actually split the tags.