I need help conjugating a french verb!?

Have a french project on a unicorn xD and i need help conjugating some irregular verbs! Can anyone help me conjugate "cro�tre" (to grow) and if not, give me a good website that will help me with that? Or if anyone is good with french, can they help me translate this phrase? (don't use any internet translators or anything because i can easily tell if they're wrong) "like a horse, but with a slender, usually spiral, horn growing out of its forehead." Merci beaucoup!!