But this is a ram of some kind, not a lamb, right?

Yes a Ram 😊 which is a fully grown lamb; a male sheep. 🐏
Associated with determination, strength, and leadership, the ram is a potent symbol. Rams, together with other flock animals, symbolized the sacrifices the Israelites had to make to appease God and give thanks.
For example: Abraham's sacrifice of his son, which was stopped by an angel and ended in the sacrifice of a ram. Abraham said, “God will provide the sacrifice.” Not only did God provide a ram as a sacrifice for Abraham, but He provided a lasting sacrifice through His own Son for Abraham, and for all of us. Though Jesus did not deserve to die, God made Him the sacrifice to wash away our own sin.