Suggestions by @jacobbrown

Bruce Dinsmore

as Robert 'Big Bob' Pataki / Harold (kangaroo) in Hey Arnold! Animals

Melissa Altro

as Miriam Pataki / Phoebe (bullfrog) in Hey Arnold! Animals

Krystal Meadows

as Grandpa Phil / Gerald (water buffalo) in Hey Arnold! Animals

Melissa Altro

as Grandma ‘Pookie’ Gertrude / Helga (bear) in Hey Arnold! Animals