I'm not sure what this is

[bubbie]

and i'm not even sure if i'm in the right forum but i was wondering if anyone here could help me out. My brother often spends time hiking in the woods and today he sent me these pictures. He found this weird thing out by a creek and he couldn’t figure out what it was and he sent these pictures to me hoping I could help because I’m pretty good at identifying nature. I don’t know what it is and no amount of internet searching could help me get any closer to the answer. It’s tentacle-like, but not like any tentacle I’ve ever seen. He says it’s purple and rubbery and when he crushed it it had insides. We’re going crazy trying to figure this out. here's the pics:
tumblr_mgqo7mBNLA1qcqp3do1_500.jpg