At the beginning of "Have Dragon Will Travel, Part 1" Hiccup is seen giving Astrid two knives to hold onto. Later in the episode she brings forth these knives so Hiccup can secure the Dragon Eye into place, while Stormfly uses her flames to light it.
- In one episode, Astrid's knives were seen stabbed into the wall of Hiccup's hut, which implies Astrid has been visiting Hiccup in his hut.
- It is unknown whether the knife Hiccup uses in "Tone Death" to free Chicken is one of Astrid's knives.
- In the episode "The Iron Gronckle", Astrid states how she's been wanting a new dagger. It's suggested that Hiccup made the knives for her in Gobber's forge, fulfilling her wish.