Steeldriver's great answer in comment
find -L . -name '*.gif' -execdir sh -c 'for f;
do convert -coalesce "$f" "${f%.gif}%05d.png";
done' sh {} +
Steeldriver's great answer in comment
find -L . -name '*.gif' -execdir sh -c 'for f;
do convert -coalesce "$f" "${f%.gif}%05d.png";
done' sh {} +