I feel like Gordon would be kinda awkward with tickling in general at first, like he's just forgotten that kind of wholesome silliness and plafulness existed. Tho i can totally see him going grumpy gruff ticklemonster once he gets used to it again (he 100% goes after Ricky first)
Oh absolutely Gordon is grumpy dad type and once he gets more comfortable being playful and a little silly, he's full tickle-monster mode!
Especially when the puppets get a little rambunctious when filming is slow. It helps burn off their energy and it lets Gordon loosen up a little bit. Granted they make him chase them around, but he needed to get back into shape anyhow.
Oh he absolutely went after Ricky when he found out they could be tickled. Turns out the little sock is pretty darn ticklish.