One of the running gags in VeggieTales is a place called Moose Lake. It’s mentioned countless times from Jonah to Minnesota Cuke and Search for Sampson’s Hairbrush to the Worship Songs CD.
Basically, the story goes that Big Idea– when it was still in Chicago– got some mail from Moose Lake that was critical of VeggieTales and the creators liked the name. So, they started using it in various places, the first one being Jonah. Mr. Lunt says that his uncle from Moose Lake is the one that gave him the outboard motor.
Just another one of those inside-type VeggieTales gags.