There are numerous wooden carvings immediately around the car park area of the visitors centre.
These owls are the same as those in Errington Woods so must be by Steve Iredale
His work is generally animals, so this is most likely his too.
This one seems a little more basic, perhaps some sort of workshop of kids ?
This walker is Steve Iredale again and dates from the Diabetes UK Great North Walk in 2010
This final carving of a face into a live tree is very interesting.
That last one looks like a dead tree that has been colonised by other plants.