Size Growth (object) – The ability to make an object and/or another living being grow larger. This power is especially useful if you also have (395) Size Reduction (object). If I have both powers then I can shrink a tank, put the tank in my pocket and then make the object full size when I need a tank. Similar to (394) Size Growth (self).
Henry Pym used this power when he was a member of the West Coast Avengers because his body could no longer take the strain of growing and shrinking (West Coast Avengers V1 #21).
There is a very good reason Henry Pym has never tried to take over the world with an army of giant ants (West Coast Avengers V2 #19).
If Henry Pym does get past the above glitch above then he might team up with the following species of intelligent ants that appeared in Uncanny Tales #38.
I did run into an interesting tale of a Professor Kravadaka who wants to create giant arthropods the old-fashioned way (Uncanny Tales #38). Spiders are of course not insects but spiders and insects are both arthropods.
In the Silver Age good guys are turned into giants against their will on a regular basis. Sometimes being turned into a giant also turns them evil so you get an evil giant! I guess the moral of the story is that being able to become a giant and then go back to normal size is great but if you are stuck as a giant then being a giant is a curse.
Action Comics V1 #325
Adventure Comics V1 #308
Adventure Comics V1 #315
Aquaman V1 #2
Challengers of the Unknown V1 #20
Challengers of the Unknown V1 #36
Detective Comics V1 #243
House of Mystery V1 #143
House of Secrets V1 #11
Jimmy Olsen V1 #77
Strange Adventures V1 #112
Strange Adventures V1 #28
Superboy V1 #50
Superman V1 #226
Wonder Woman V1 #136
Size Lad (DC) can make objects shrink and grow in Adventure Comics V1 #337 (DC).
Muto (DC) uses an expander ray in Action Comics V1 #339.
Zunial (DC) uses a gigantizing ray in Superman V1 #188.
In The Food of the Gods and How It Came to Earth by H.G. Wells, a special food can make animals and humans larger (Classics Illustrated #160).
Tommy Tomorrow (DC) faces a sci-fi version of The Food of the Gods in Action Comics V1 #135.
Jimmy Olsen – “Brainiac…Big Time Operator” – Superman’s Pal #116
Make sure to read: Size Lessons in Comic Books