Kind of, right? But it also makes sense. We might talk about a highly populated country having a lot of cities -- even though cities are just somewhat loosely defined pieces of the population total.

See 'List of longest glaciers on Earth in non-polar regions'

https://en.m.wikipedia.org/wiki/List_of_glaciers

A glacier is defined by the valley/valleys it inhabits, it has a locality and flows like a river does. It seems odd to give it a name, but it is no more odd than naming a river.

glaciers do have a certain minimum size, though.