And speaking of Bosko, there is also Bosco. This

Then there’s this ad with Dick van Dyke from 1959.

But then there’s the version I remember.

I hate Bosco! It’s so bad for me. Mommy puts it in my milk she tries to poison me.

But I fooled Mommy and put it in her tea. Now there’s no Mommy left to try to poison me.

Bad. But the tune and the words are with me sixty years later.