October 25, 2011 11:00 AM

Two-year-old Walker Nathaniel isn’t the only one learning new words in Taye Diggs and Idina Menzel‘s household. The Private Practice star tells PEOPLE that he has taken on an entirely different vocabulary since becoming a dad.

“The most ridiculous thing I have heard myself say is, ‘Do you want your pop-pop, your banky or your baba?’ Translation: ‘Do you want your pacifier, your blanket or your bottle?'”

The actor, who recently wrote his first children’s book Chocolate Me!, says “zerberting” — a.k.a. blowing raspberries — is another popular term at home, as is “nakedy time,” which is when Walker runs around the house sans clothes prior to his bath.

Courtesy Taye Diggs

Another language the two share is music. Diggs and his wife — known for her powerful pipes on Broadway and Glee — are constantly in tune with their toddler.

“I sing him an assortment of songs,” Diggs, 40, tells PEOPLE. “We made one up just for him called ‘Sleep Walker Sleep’ and we sing random songs from musicals in a really slow go-to-bed tempo.”

But Walker’s favorite singer at the moment appears to be none other then Beyoncé.

“His favorite song is ‘Single Ladies,'” laughs Diggs. “He really gets down to that one.”

— Mia McNiece

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