japanese characters ponkikki and gachapin?

Gachapin is the green one (who's meant to be a dinosaur), and the red one is a yeti named Mukku. I have no idea who the boy is. They come from a Fuji TV show called ひらけ!ポンキッキ (Hirake! Ponkikki), and I only know them because Thomas & Friends made its Japanese debut on said show. They even made three crossover specials that feature the characters meeting Sir Topham Hatt and the engines, none of which were ever released anywhere else. Gachapin and Mukku visit Sodor in Thomas and the UK Trip.