|Grumpy Old Troll|
|Name||Grumpy Old Troll|
|Interests||Making up riddles|
|Dislikes||When someone solves his riddles (formerly)|
|First Appearance|| Pilot (unaired)|
Surprise (Dora the Explorer) (aired)
|Last Appearance||Return to the Rainforest (Dora and Friends: Into the City)|
|Friends||Dora, Boots (occasionally)|
|Relatives||Petunia (wife), Grumpy Old Troll's Grandma (Grandmother)|
|Voiced By||Chris Gifford|
The Grumpy Old Troll (sometimes called Mr. Troll) is a troll, who lives under a bridge that Dora and Boots sometimes come across. When someone tries to cross his bridge, he will jump out and sing a song telling the person that they need to answer a riddle or else they will not be allowed across. but never cause trouble together.
He is almost always mad or angry. He enjoys making up riddles for visitors who try to cross his bridge. However, he is shown to be happy at times and does have a few hobbies.
The Grumpy Old Troll is mostly yellow. He has a long orange beard and an orange mustache. He has white eyes with black pupils. He does not wear any clothing at all.
Grumpy Old Troll appeared in some episodes of Dora the Explorer. His first appearance was at the ending of "Beaches".
- Season 1 - Surprise!, Bouncing Ball, Backpack, Little Star, Call Me Mr. Riddles
- Season 2 - The Happy Old Troll, To the Monkey Bars
- Season 3 - The Fix-it Machine, The Super Silly Fiesta, Louder!
- Season 4 - The Shy Rainbow, Dora's World Adventure
- Season 5 - Dora's Christmas Carol Adventure
- Season 6 - The Grumpy Old Troll Gets Married, Dora in Troll Land, Halloween Parade
- Season 7 - Perrito's Big Surprise
- Grumpy Old Troll tends to be grumpy most of the time. In season 1, whenever the troll sees Dora & Boots solve his riddles, he gets angry and lets out steam. Other times, he would stomp his feet. On later episodes, he gets more impressed after Dora & Boots solve his riddles.
- Most of the time, anyone who tries to cross his bridge has to solve a riddle. Sometimes, he gives an instruction or a task to do.
- When Dora and Swiper traveled through time in "Dora's Christmas Carol Adventure", Grumpy Old Troll had no mustache and no beard when he was a baby.
- The Grumpy Old Troll and his wife Petunia appear in the Dora and Friends episode, "Return to the Rainforest".