90s (or earlier) computer game where a troll turns you into a frog

Question

This was a game I played in school aged 5 or 6 (in year one or two), which would be in 1991. I believe it was on a BBC Acorn, though it might have been some other computer; it seemed old fashioned to me at the time, anyway, so probably something from the 80s.

The game was, I think, very similar to Granny's Garden; blocky text interspersed with colourful images, educational/puzzley gameplay and a second person style of prose. (At least, I think there were pictures; I might be conflating it with Granny's Garden and it was actually just text). Since this was in primary school it was most likely an educational title (or edutainment), or something that was distributed to schools.

The only part of the game I can actually remember, though, is that at one point a troll (possibly ogre?) turns you into a frog (possibly toad?) and that, rather than being a bad ending, this makes you small enough to fit through a tunnel (or something) that you couldn't previously get through, so is required to advance to a new area.

I've tried checking out 4mation's other games besides Granny's Garden (Flower of Crystal, etc) but they still enforce copyright rigorously; from what I've seen on YouTube videos, though, it doesn't seem to be one of them.

Edit: I've been looking through some old BBC games, and screenshots by the company "Sherston Software" (for example, this game) seem fairly similar to my recollections, so it's possibly part of their catalogue. Unfortunately they seem rather poorly documented online, so I can't tell for sure - but the style of game matches up.

Answer 1

Maybe it's the ZX Spectrum game "Camelot Warriors" (1986). Watch this video in case it brings back any memories.

"Camelot Warriors" is a platform game for ZX Spectrum and some other 8 bits computers with a fantastic medieval setting in which the character must take a series of modern objects (a light bulb, a soda can) to a series of final mages in each phase.

In order to survive in the water phase the character needs to be transformed into a frog by one of these mages.

Answer 2

Just to run down Acorn games that involve being turned into a frog, apparently The 4th Dimension's Demon's Lair (1993) has that happen as per this review:

Apparently your village used to be protected by a kind dragon who has been captured and imprisoned in chains (must be pretty strong chains then!). The villages greatest warrior has been sent to release the dragon and stop the terror plaguing the village folk. You are not this warrior though (and you though you stood a fighting chance, huh!) because he has already fallen foul of the enemies that he has dared to face. You are just another member of the village community and have, unfortunately for you, drawn the short straw to go and free the dragon.

....

Another of the points that I really enjoyed (call me a masochist if you like) was the point at which I mistakenly stayed too close to the witch for too long. Well, the character (whose name, incidentally, is Bob) is turned into a frog. Painful, you might say, but believe me it is useful in certain situations

Gameplay

Around the 2:00 mark, you see Bob enter into a small door that he could not fit in before. It's not a troll, but it is a green-skinned witch, which could be mistaken for a troll. It's also more action-oriented than you suggested the game would be.

Found with a search for "bbc acorn" "into * frog"

Answer 3

If "some other computer" is possibly an early PC, this description is somewhat Kings'-Quest-ish (1984). You use simple commands to guide the onscreen player around the map and various responses appear. Unfortunately, there's no text in this snap, but it was definitely blocky!