gif2png(1) on Linux
The text 88400a882a8d, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
convert GIFs to PNGs
Flags it lists
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-O -
-b -
-d -
-f -
-g -
-h -
-i -
-m -
-n -
-p -
-r -
-s -
-v -
-w