In English, ‘moose’ rhymes with ‘goose’ so people sometimes wonder why the plural isn’t ‘meese’ to rhyme with ‘geese’.
Unlike ‘goose’ which becomes ‘geese,’ the word ‘moose’, which comes from a native American Algonquian language, doesn’t change in the plural. Instead, it stays in its original form.
So, when you’re talking about moose, it’s ‘moose’ for both singular and plural. That is actually quite standard with loanwords, and in this case, perhaps, the influence of “goose / geese” prevented the formation of “mooses” as the plural, because “that’s just not what you do with that kind of word”.