Ant Mimicry – The ability to take on the form and/or characteristics of an ant.
The Savage Dragon (Image) universe has Ant People.
Adventurers have to face giant ants in the D&D universe (D&D 4th Edition – Monster Manual 2).
In the Marvel universe, Grottu (Marvel) was a giant ant that tried to take over Earth (Marvel Monsters-From the Files of Ulysses Bloodstone).
Atom Ant was a Superman type superhero in the Hannah Barbera universe.
Some one-shot ant action in the Silver Age, in Tales to Astonish v1 #14, Strange Adventures V1 #7, Strange Adventures V1 #30, and Superman V1 #110.
Superman becomes ant like in Action Comics V1 #296 in order to communicate with ants.
Abyss Ants – TSR 2145 Monstrous Compendium Annual Volume 1
Formian – D&D 3.5 – Monster Manual I
Giant Ants – Space Family Robinson-Gold Key #33 (1969)
Saber King of the Jungle – Tiger #763 (1969)
Jimmy Olsen (DC) threatens Superman with a giant ant and some kryptonite in Jimmy Olsen #54.
You just never know when giant ants are going to show up, Beezer #1000 (DC Thompson)!