Counting?

Ok, I may be imagining things, but I think I hear E counting.

Every once and a while, he points and goes "One", "Two", "Tee", "Foe", "Fi".  Now, I have never worked with him on counting so this must be something he has picked up at school.  Maybe they are singing a song or something, who knows.  But, I MUST ask the teacher soon.

I've been telling D about it and he didn't believe me until tonight.

H said, "E - Say One"
E and (H) together "Two(Two)...  Tee(Three)...  For(Four)...  Fi(Five)...  Sissy(Six)...  Mama(seven)"