I live with a two-year-old and a four-year-old and phrases like "Silly Billy" and "Okie dokie, Artichokie!" are spoken almost hourly. Why? Because they're so much fun to say! AND because, like magic, my girls pay more attention to me when I rhyme!
I consulted my Facebook friends for some examples of short Spanish rhyming phrases and I loved their responses. I think these would be perfect for any bilingual teacher to incorporate into her daily dialogues. Remember, they're like MAGIC! Kids listen to them AND they repeat them.
Of course, they might confuse them at times too. My two-year-old told her nursery teacher at church today, "See you later, crocodile!" :) Baby steps...baby steps!