Adam Clarke on 2 Kings 23:11

The horses that the kings of Judah had given to the sun - Jarchi says that those who adored the sun had horses which they mounted every morning to go out to meet the sun at his rising. Throughout the East the horse, because of his swiftness and utility, was dedicated to the sun; and the Greeks and Romans feigned that the chariot of the sun was drawn by four horses - Pyroeis, Eous, Aethon, and Phlegon. See the note on 2Kgs 2:11.

Whether these were living or sculptured horses, we cannot tell; the latter is the more reasonable supposition.