The Bigfoot "freeze" is a known glitch. First try rebooting Poptropica. If that fails, leave the island (you can do this easily with the Haunted House card from the store). Then come back after you have played awhile, as this seems to clear the bad code from your cache.
If this fails, your only option is to (urk) restart the island from the small map.
*if you leave and come back using the Haunted House/island map, just go right from Main Street to enter the gate at the Mews mansion.
You have to try a different server or just reload if none of the above work then who knows
It explodes and the apocalypse happens.... What do you think happens? it freezes
It freezes.
You follow him to his home in the caves. But Gretchen Grimlock cages him and tries to carry him away. You have to chase her in your helicopter, jump over to it, open the gas tank, and jump down to cut loose the cage.
it's freezes
Assuming there is a bigfoot it would decompose the same as any other body.
As the water freezes, it will expand.
It would depend upon which "guy" you have to follow. You are not supposed to follow the boatman when he leaves. If you don't follow the herder behind the rocks, the chupacabra does not appear. If you lose sight of Bigfoot, you cannot follow him the the caves, which let's you complete the quest.
Because its showing you found bigfoot. It also happens to the other monster. Hope it helps.
It burst out.
it gets cold and freezes
Go and meet Harold Mews.