The English word for carrots is carrot, which is a countable noun, and countable nouns become plural usually by adding an s to the end of the noun, so the plural form of carrots is carrots.

Countable nouns are those that can be counted by number, such as a Carrots, in addition to countable nouns, have uncountable nouns, which generally do not have a plural form, and can be joined by some, any, little, etc., not by counting words.