Awwwww yes yes yes I love this thank you thank you thank.
Since Hiccup lost his mother when he was an infant, he would not call out for his mother because never in his living memory was she there (ouch). We would assume that, if Stoick took primary care of Hiccup - rather than, say, one of Hiccup’s many aunts - then Hiccup would come running up crying to his father when he scraped a knee or felt a little sick to the stomach. Poor Stoick would probably have to deal with a lot since, “ever since he could crawl, he was different”… and certainly a whole lot of trouble which would lead to toddler tears.
I would bet young!Hiccup definitely asked about his mother. I also bet Stoick would not say much specific about Hiccup’s mother, either. Hiccup would have been told the general gist of things by Stoick or another Viking when he was older, for he clearly heard that Valka was taken by dragons. He probably also heard some other vague positive stories about Valka, but nothing negative.
Hiccup would not have been told about Valka being unpopular with the other Vikings.
Hiccup DEFINITELY would not have heard Valka was a dragon lover. Any mention of Valka with dragons would have been negative, reinforcing the danger the species played on Berk.
But I imagine lots of the comments would have been nostalgic vague remarks from Stoick like, “Your mother would have…” Stuff similar to what we see at the end of “Breakneck Bog.” Telling Hiccup his mother would have been proud, or sentimental words to that extent. It would have been hard for Stoick to talk about, and he would have just said good vague things about her.
But I think that somehow, despite the entire Berk village knowing about Valka, Hiccup actually received only filtered information about his mother. He seems completely unprepared for her being a dragon lady - he has had no warning that someone else besides himself is sympathetic toward dragons! So little Hiccup very well would have asked about his mother out of curiosity and nostalgia for what he never had, but he would not have heard the full story. He might have been suspicious of what was being hidden or he might never have noticed others omitted information. But Hiccup’s account and understanding of his mother, coming from what Stoick and others would have told him, is incomplete throughout his childhood.