50's Ipana toothpaste had Bucky the Beaver singing:
"Brusha, Brusha, Brusha, with the new Ipana, Brusha, Brusha, Brusha, with the new Ipana..." can't remember the rest

The DoubleMint twins jingle began: "Double your pleasure, double your fun..."

Toni Shampoo slogan "Which twin has the Toni?" led to a lot of double entendre jokes.

Carling Black Label had a jingle that went "Hey Mabel, Another Black Label" or something like that. This was more often sung as a parody which went "Mabel, Get off the table, the dime is for the beer."

In the forties there was the bell-hop in the hotel lobby who shouted out "Call for Phillp Morris!!".

Also back then Buster Brown shoes had this ditty:
I'm Buster Brown,
I live in a shoe.
That's my dog Tye,
He lives there too.

And who could ever forget the obnoxious kid who repeatedly whined out:
"More Park Sausages Mom!!"?

BTW, the Serutan ad went: Serutan is Natures spelled backwards, not the way you have quoted it.

In NYC Piel's Beer had a cartoon pair called Harry and Bert Piel, but I don't remember any jingle. Maybe someone else...?

Castro Convertible Sofas also had a jingle in the 50's that escapes my memory.