(informal, figuratively) chicken scratch (illegible handwriting)

(informal) short-legged

(literally) to walk on all fours; walk on all four legs / (idiomatic, baby) to crawl

(idiomatic) unicorn; black swan; flying pig (a kind of chimera that doesn't exist)

(figuratively) to land on one's feet, to fall on one's feet

to be nothing to write home about (to be mediocre; to be nothing out of the ordinary; to be nothing special)