Exodus 4:3

“Throw it on the ground,” said the Lord. So Moses threw it on the ground, and it became a snake, and he ran from it.

Note Hebrew nachash, in contrast to Aaron’s staff, which became a tannin in Exodus 7:10

And he said, Cast it on the ground. And he cast it on the ground, and it became a serpent; and Moses fled from before it.

He said, “Throw it on the ground.” He threw it on the ground, and it became a snake; and Moses ran away from it.

And he said, Cast it on the ground. And he cast it on the ground, and it became a serpent; and Moses fled from before it.