No, a mass noun is an uncountable noun; a word for something that can't be counted, such things as concepts (knowledge) and substances (steel).
A count noun is a noun that can be counted. A count noun has a singular form (a word for one person, place, or thing) and a plural form (a word for two or more people, places, or things).
The noun insects is the plural form for the singular noun, insect. The noun insect is a count noun.
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The mass is called a swarm
A mass of insects is called a swarm. There are more than one million species of insects found around the world. Over 100,000 species live in the United States.