\documentclass{article}
\usepackage[paperwidth=10cm, paperheight=5cm, margin=1cm]{geometry}
\usepackage{tikz}
\usetikzlibrary{shapes}

\newcommand{\textCloud}[4][180]{% #1: angle        #2: fill color
                                % #3: text color   #4: text
    \begin{tikzpicture}[overlay]%
    \node[align = center, draw, fill=#2, text=#3, cloud callout, cloud puffs=17, cloud puff arc=140, callout pointer segments=3, anchor=pointer, callout relative pointer = {(#1:2cm)}, aspect=4, scale=0.5] at (2ex,0.5ex) {#4};%
    \end{tikzpicture}
}%

\pagestyle{empty}
\begin{document}
Aaaaaaaaaaaaaaaaaaaaah\textCloud{red}{white}{Thank you!}

Oooooooooooooooooooooh\textCloud[160]{blue}{white}{Thanks again!}

bla bla bla bla bla bla\textCloud[120]{gray}{blue}{Thanks yet again!}
\end{document}