I just finished a class with my Pre-Ks (4yrs). I am introducing some animals. I put Beanie Babies into my Magic box and pulled them out after asking the class "1-2-3 ¿Qué animal es?"
I let the students guess the words in English and then just repeated them in Spanish " NO, no es un perro".
When a student guessed it correctly (ex. oso (bear)) , we all said "Hola oso".

We were all sitting in a circle and I then gave the oso beanie babie to one of the students and the game was for the student holding the bear to say the word "oso"  as fast as they could and pass it on to the next student until the oso went around the entire circle.

All the kids were very excited about it and were still saying "oso, oso, oso" while they were leaving the classroom and down the hallway.