Exodus 12:5 says, “Your lamb shall be without blemish, a male of the first year: ye shall take it out from the sheep, or from the goats.”

That is a true and proper statement to make.  Merriam Webster’s 11th Collegiate Dictionary defines “lamb” as, “a young sheep, especially, one that is less than one year old or without permanent teeth; the young of various animals other than sheep.”  So you can see that even a secular dictionary acknowledges that various other young animals are referred to as "lambs."

Psalms 19:7-9 says, “The law of the LORD is perfect, converting the soul: the testimony of the LORD is sure, making wise the simple.    The statutes of the LORD are right, rejoicing the heart: the commandment of the LORD is pure, enlightening the eyes.   The fear of the LORD is clean, enduring for ever: the judgments of the LORD are true and righteous altogether.”