Words left and right

Ian is learning words left and right lately. On Friday on the drive he learned tunnel and then said it at every opportunity for the family on Saturday. He knew this morning that Thomas went into a tunnel and said it again without me asking - so he understands the concept of a tunnel as well as being able to say it clear as day. The also learned tusks, Kate, Mike, and started to say Hippo this weekend. Today we've noticed color, desk, chair, taco (its what we had for dinner), spam (we went to the grocery store and Steven was just reading off labels), hammer and pillow. I can't keep count of how many words he knows. And he will say a couple together to make a sentence - usually including Dadda in it - like Dadda tunnel train. Or Dadda bath duck. The last one was just Dadda gaga hahaha (don't know what that one was but he thought it was really funny).