Even though I'm not a part of wicca, I believe it is based around love and harmony with nature and spirit, including healing that Christians also do.
Nothing will ever be created with the intention of being evil if it is truly wiccan - coming from a fairly spiritual perspective, I think, as you are a Christian, to open your mind to potentially beautiful ways of life and not to place your own judgement on it from just a preconcieved idea.
Do research, learn about it, and know that just because a particular belief system is alien to your own it doesn't have to be dangerous.
TLDR a wooden frog isn't gonna hurt you, it isn't evil, and open your heart to the true nature of paganism.
(tbh christians talking in tongues is just freaky so who are you to say wicca is any worse. It is a cult, but so is every religion hunny)