Miko loooves his kong toys! But I don't put any paste or treats inside of them at all. He loves the way they bounce when I throw them when we're playing fetch
He also runs around the house with it in his mouth. Emma loves the kong toys too, she likes to chew on them though
We also got the new Kong Wubba which is awesome...Both of my furbabies love it and they play tug of war with each other...It's neat, maybe your babies would like the wubba