What is with this Summon???

[Rikud0 Sennin]

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A combination of all three sage's!!!
Toad, Snake, and Bone!

The 3 places you can learn senjutsu:

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[HokageTobiramaXx]

It's a chameleon.

Weird tail though but looks nothing like a slug and similar to a toad.

 

[Dreckerplayer]

Ryuchi cave...I'm waiting for that sage mode, tsunade.

I hope she doesn't turn into a complete slug...

 

[Rikud0 Sennin]

there is no slug sage mode. :facepalm:
Toad, Horn/bone, Snake tail

 

[Horus]

Im waiting for Tsunade's sage mode.