the answer is mongoose :)
According to dictionary.com (linked below) the correct plural of "mongoose" is "mongooses." Mongoose is made plural by the addition of an "s," just like other nouns with regular plurals. e.g....
It's mongeese... GO CANADA... YAAAY
The plural of mongoose is mongeese. 1 mongoose 2 mongeese 3 mongeesesThat last bit is a joke. There is no such word as mongeeses
Unlike the word goose, the form does not change - it is mongooses.