Here’s one of those funny, the singular form is is also the plural, words I particularly enjoy.
From the Nature Bulletin No. 504-A of Cook County IL, October 27, 1973
The word “moose” came to us from Algonquian Indians. Consequently
its plural, instead of being “mooses” or “meese”, is the same as the
singular. That is true of most Indian names whether of a tribe, such as
the Winnebago and Potawatomi, or of an object such as papoose. It is
also true of many wildlife names not of Indian origin — for example:
deer, mink and grouse.
Perhaps coincidentally, moose are generally solitary animals.
Moose are the least social species among cervids, remaining fairly solitary except during the mating season.
The quote above from the answers page “are groups of moose called herds“, to which the answer is yes, but only during mating season – one male herds a group of females.
No image of a Moose herd could be found in the 15 minutes I spent looking. Sorry.