Not the Eaglet.. It should have at least a .15, and I learned on one with an OS20FP and IT was power-challenged. Suggestion previously for the Piece O Cake was a good one, as long as you don't have to taxi crosswind. The polyhedral wing is real prone to tipping over.

I have seen a Wild Thing fly successfully with floats. A .10 on one of those should do it. Or a Sig Wonder. You'd have to keep it light and use foam floats. Neither normally uses rudders, and the WT I saw had the water rudder linked to the ailerons...taxi out slowly, point it in the right direction, and nail the throttle. Awkward, but possible.