I know it's not easy for everyone but I think if one would say "GIMP!" with bit more confidence it would already help a lot.
Instead of doing the awkward:
"I-I use G-Gim.." sweats nervously "uummm Gimp.. It stands for GNU Image..." ÜwÜ
Alternatively just say "I edit/create the images myself and use Canva to animate it"